Astronomy and Physics

August Sky Spotlight

Astronomy and Physics, Earth, News

2nd: Moon at Perigee

On August 2nd, the Moon will be at its closest spot to Earth. This is called perigee.

7th: 1st Quarter

The Moon will be in its first quarter phase!

9th: Moon and Jupiter; Mercury in Greatest Western Elongation

The Moon and Jupiter will meet in the constellation Scorpio in the Southwestern sky.

Saturn, Venus, and Mercury in a dawning sky. Source: universetoday.com

Since Mercury is in between the Earth and the Sun, Mercury is always in the daytime sky. As Mercury goes around the Sun, it gets closer and farther away from the Sun in the sky. On the 9th, Mercury will be as far from the Sun as it gets. This is called greatest western elongation. This is when Mercury is at its best viewing because it’s not washed out by the Sun.

11th: Venus and Sun

On the 11th, Venus and the Sun will be together in the constellation Cancer! However, the Sun’s brightness will make this nearly impossible to view. Look towards (but not at) the rising Sun in the East.

12th: Moon, Saturn, and Pluto; Perseid’s Peak

The Moon, Saturn, and Pluto will be together in Sagittarius on the 12th. To see them, look towards the Southern sky.

In addition to seeing the Moon and planets, this night will feature one of the best shows the sky puts on: a meteor shower. The Perseid Meteor Shower will peak the night of the 12th and into the morning of the 13th. Look to the Northeast to see the show. Unfortunately, the bright Moon will inhibit viewing, but there will still be plenty to see!

15th: Full Moon, Venus at its Brightest 

The 15th will bring a full moon! And, if you look at the dawn sky, you will see a very bright Venus.

17th: Moon and Neptune; Moon at Apogee

The Moon and Neptune will appear together on the Eastern side of Aquarius. In addition, the Moon will be at apogee, it’s farthest point from Earth.

21st: Uranus and Moon

On the 21st, Uranus and the Moon will be seen in the Eastern sky in Aries.

23rd: Last Quarter; Venus and Mars

The Moon will be in its last quarter phase on the 23rd, while Venus and Mars will be together in the sky. They will be near the Sun in the constellation Leo.

29th: Mercury, Moon, and Sun

On the 29th, Mercury, the Moon, and the Sun will all be together. Look to the dawn sky to see them.

30th: Moon, Venus, and Mars; New Moon; Moon at Perigee 

The Moon, Venus, and Mars will be near the Sun; dawn will bring the best viewing. However, the new moon may be difficult to spot. Finally, the Moon will have returned to its closest point to the Earth.

31st: Sun and Mars

The Sun and Mars will be together in the constellation Leo.

Dyson Spheres: Smart or Stupid?

Astronomy and Physics, Earth, News

The other day my dad made a bold claim: Dyson spheres are stupid. I told him that they were not stupid, and he replied that they are because they’re physically impossible. 

I have to admit, he may have a point there. I mean, a true Dyson sphere would have to be quite large. That would take a lot of materials. Does the Earth have enough materials? Does the solar system? 

A Dyson sphere is a theoretical structure that encompasses a star. This structure would harvest as much sunlight as possible.

Olaf Stapledon made the first mention of Dyson spheres in his book Star Maker, but Freedman Dyson later proposed them in a scientific journal as a solution to an advanced civilization’s energy shortage. We rank hypothetical advanced civilizations on the Kardashev Scale, which is based on energy consumption. Currently, humans are not advanced enough to show up on the scale. However, a civilization with a Dyson sphere would be a Type II civilization—they would be able to harness the energy of their star. 

The sun is constantly producing 386 septillion watts of energy. Less than a billionth of a percent of this energy reaches the Earth. Humans harvest even less than this. Clearly, there is a ton of missed solar energy. 

But how would a Dyson sphere actually work? If it were to encompass the sun, but not the Earth, we would no longer receive sunlight. That wouldn’t work; it’s common knowledge that we need sunlight for life. So maybe it should follow the Earth’s orbit, with a little gap for the Earth. Or maybe it should be a little bigger than the Earth’s orbit and hold us inside too. Either way, that would be an astronomically large structure. The Earth is 93 million miles from the sun, so a sphere of that size would have a surface area of 109 quadrillion miles squared. My dad is right, that would be (nearly) impossible. There are not enough materials on the Earth. Luckily, there are enough materials in the solar system to build one. However, I wouldn’t count on it. 

An artist’s concept of a Dyson sphere. Source: CapnHack, via energyphysics.wikispaces.com

Okay, so we can’t have a Dyson sphere. But maybe we can have a Dyson part of a sphere? Or a Dyson fleet of satellites? Some (my dad), may argue that this is not a true Dyson sphere, but we could harvest far more energy than we do now. Right now, humans can only dream of a Dyson sphere. We don’t have the technology to build such a thing. Even a simpler version would be way out of our league. An array of satellites would need carefully calculated orbits. However, some of these orbits would probably overlap, thus blocking the very light they were sent to collect. 

While a Dyson sphere would be really cool, we don’t need to go to space to harvest light for energy. I mean, we have plenty of working solar panels on Earth. Plus, they’re becoming more popular; solar energy has been increasing for years and continues to do so. While solar energy isn’t as efficient at producing energy as fossil fuels are, you don’t have to pay for sunlight. 

Maybe Dyson spheres are in our future—not our near future, of course. I, for one, don’t have a lot of hope. I think they’re a cool theoretical structure, but I believe they will remain exactly that: theoretical. I would also like to say that my dad is not right. Dyson spheres are not dumb. We just have to be smart enough to build them.

A Trip into the Life of Sally Ride

Astronomy and Physics, Earth, News, women in science

Sally Ride was born on May 26, 1951, in Los Angeles, California. She went to a private high school on a scholarship, where she was a bright student and an excellent tennis player. Ride first attended Swarthmore College in Pennsylvania but ultimately graduated from Standford where she majored in physics and English. She went on to earn her Ph.D. from Standford in 1978. There, Ride studied x-rays emitted by stars. 

In 1978, Dr. Ride applied to be an astronaut after seeing an ad in the school newspaper. She was among the first six women to be selected and had to go through intense training. Ride was not a pilot, but she still had to spend time in a plane—just not in the pilot’s seat. Instead, she trained by being the navigator and communicator for the pilot. Ride loved her time in the plane. In fact, she loved it so much that she later got her pilot’s license. Before going to space, Ride worked in Mission Control. There, she was capsule communicator (CAPCOM for short), which serves as the link from ground to space. NASA prefers astronauts at CAPCOM because they know all the astronauts’ slang.

Source: NASA

Unfortunately, as a female astronaut, Ride faced lots of sexism. People were not used to seeing a woman in such a role. Members of the media often asked Ride extremely sexist questions they would never ask her male colleagues. She was asked “Will the flight affect your reproductive organs?” and “Do you weep when things go wrong on the job?” Luckily, Dr. Sally Ride never let the ignorance of the media stop her. 

Finally, in 1983, Ride became the first American woman in space. Ride flew on the space shuttle Challenger, and successfully completed her mission with her crew. On the shuttle, Ride operated a robotic arm that put satellites into space. Two of these satellites were simply communication satellites, but another carried experiments. Then, in 1984, she went to space again, also aboard the Challenger. She was training for a third mission when the Challenger Disaster occurred. Her mission was canceled, and she would never go to space again. In total, Dr. Sally Ride spent 14 days, 7 hours, and 46 minutes in space. 

The thing that I’ll remember most about the flight is that it was fun. In fact, I’m sure it was the most fun I’ll ever have in my life.

Sally Ride

Ride was selected to the Rogers Commission, which investigated the Challenger explosion. She was instrumental in discovering the cause of the disaster. In 2003, she was asked to help investigate the Columbia accident. She is the only person to serve on commissions for both accidents. 

In 1987, Ride left NASA to work at the Stanford University Center for International Security and Arms Control. They educate tomorrow’s leaders of international policy, while also influencing today’s policy. Just two years later, she became a physics professor at the University of California, San Diego. In the 90s, she led NASA outreach programs that allowed students to ask for images of the Moon and Earth. She co-founded Sally Ride Science in 2001, a company that focuses on encouraging students, especially girls, to get into science. There are so many aspects of science that aren’t well known, so Sally Ride Science shows kids what futures lie in science. This non-profit thrives to this day.

Sally Ride Science. Source: NASA

On July 23, 2012, Dr. Sally Ride died. She had pancreatic cancer, one of the most deadly cancers. After her death, it became known that she had a female partner. She had a husband while she was an astronaut, but the marriage quickly ended in divorce. Sally Ride and Tam O’Shaughnessy had been partners for the 27 years prior to Ride’s death. Ride had been very private with her personal life, so the public was unaware of this. Ride is the first known LGBT astronaut. 

Sally Ride continues to be an inspiration to this day. She blended science with humanities as an undergrad. She serves as a role model for both young girls and LGBT youth as her legacy lives on through Sally Ride Science. She is the epitome of strength and perseverance, and I look to her when I find myself faced with sexism. We will never forget Sally Ride. Dr. Sally Ride ensured that the world she left behind was better than when she came. We can all learn a lesson from her.

To read more about Women in Science, check out the links below:

Mae Jemison: Astronaut, Doctor, Icon

Astronomy and Physics, Earth, News, women in science

In September 1992, the Space Shuttle Endeavor rocketed into space with astronauts and science experiments. This was a routine launch, containing a healthy mix of new and experienced astronauts. One astronaut, however, was making history. That day, Dr. Mae Jemison, serving as mission specialist 4, became the first African American woman in space.

Jemison was born in 1956 in Alabama but moved to Chicago at a young age. As a child, she was inspired by Star Trek’s Lieutenant Uhura. This, along with her parent’s encouragement, fueled her love for science and space. In addition to being remarkably bright, Mae Jemison was also a skilled dancer. 

At 16, Jemison entered Stanford University and earned degrees in Chemical Engineering and African American Studies, despite the fact she faced frequent racial discrimination from her professors. After graduation, she faced a tough decision: medicine or dance. Jemison chose to attend Cornell University and earned her Doctorate in Medicine. While in school, she worked at a Cambodian refugee camp and with Flying Doctors in East African . Later, she worked with the Peace Corps and the Center for Disease Control. 

Left: Mae Jemison’s astronaut portrait. Right: Jemison in space. Source: NASA

Inspired by other female astronauts such as Sally Ride, Dr. Mae Jemison applied to the prestigious astronaut program and was selected in the first group following the Challenger disaster. She flew to space on mission STS-47. Jemison conducted experiments focused mainly on life sciences, including one that involved observing tadpoles in zero-gravity.

Don’t let anyone rob you of your imagination, your creativity, or your curiosity. It’s your place in the world; it’s your life. Go on and do all you can with it, and make it the life you want to live.

Mae Jemison

A couple months after returning to Earth, Jemison resigned from NASA and returned to the medical field. She served on the World Sickle Cell Foundation’s board of directors. She founded the Jemison Group Inc. and a the Dorothy Jemison Foundation, named for her mother, which runs a science camp for children.

Jemison later worked as a professor of environmental studies at Stanford and as one of Cornell’s Professors-at-Large. She is an advocate for science education, especially among minority children. She then founded BioSentient Corp, which works with research she conducted aboard the Endeavor.

Mae Jemison in 2018. Photo by Andy Kropa/Invision/AP

In 2001, she wrote a memoir for children about her life titled Where the Wind Goes, which gives an glimpse into her time as a female student of color. In addition, she wrote multiple children’s books. The Dorothy Jemison Foundation won a prestigious award along with 500 thousand dollars. She also appeared on Star Trek: The Next Generation (season six episode 24 if you’re interested) and was the first real astronaut to do so. 

The point is, Dr. Mae Jemison is an incredibly accomplished woman. She does anything she set her mind to. She is so much more than the 190 hours, 30 minutes, and 23 seconds she spent in space. She is a doctor, an advocate, and an author, and I am personally inspired by her perseverance, strength, and intelligence.

To read about more women in science, check out the links below:

The Universe in Your Hands Book Review

Astronomy and Physics, book reviews, News

One thing about astronomy that has always overwhelmed me is its complication. It seems like you need a degree to understand even the simplest literature. Luckily, there are more books about astronomy than ever before, and you need to know less than ever to understand them!

One of my favorite astronomy books is The Universe in Your Hand by Christophe Galfard. This book boasts its use of only a single equation: E=mc^2. There is no math involved. It is purely conceptual, written simply enough for anyone to understand. This book is not for physicists, which is ideal because I (along with many others) am not a physicist. It is the perfect book for the casual astronomy enthusiast as well as the young astrophysicist-to-be.

I love this book because it has calm energy. The book opens with you, the reader, on a beach looking at the stars. The scene exudes peace and relaxation. There is nothing like learning a difficult concept by having it whispered calmly in your ear. Galfard carries this serene energy throughout the entire book.

The Universe in Your Hand is written in second person, with the author referring to the reader as you almost constantly throughout the book. I realize that some people will be skeptical of this, but trust me, Galfard makes it work. You are making the discoveries that answer the questions of the universe. The reader realizes what is happening around them, then Galfard explains it. The reader feels like a part of the experience and is invested in the text.

The book covers everything: string theory, black holes, quantum particles, photons, the life cycle of a star, and so much more. It’s the perfect glimpse into physics without confusing formulas.

I would recommend this book to anyone who is interested in astronomy or astrophysics. Many of my physics friends have borrowed and enjoyed my copy of The Universe in Your Hand. It is perfect for anyone who wants to read about physics but often finds themselves confused by the difficult math involved. You do not need a background in physics to understand this book. If you want to dip your toe into physics, this book is for you. If you are intimidated by the complexity of physics, this book is for you. If you are interested in a lighthearted scientific read, this book is for you.

My point is that this book is for anyone. It’s one of the most accessible scientific texts I’ve ever read. Don’t fear physics, just read The Universe in Your Hand

Nancy Grace Roman: the Mother of Hubble

Astronomy and Physics, Earth, News, women in science

Dr. Nancy Grace Roman was interested in astronomy from the very beginning. Born in Tenessee in 1925, in elementary school Roman was a co-founder of an astronomy club. She went on to excel in a Baltimore high school and attended Swarthmore College to earn her bachelors degree in Astronomy. In 1949, she received her doctorate in astronomy from the University of Chicago.

Dr. Roman in 1962. Credit: NASA

Shortly after earning her Ph.D., Dr. Roman found a star with unusual emission spectra. This discovery helped her create a name for herself among astronomers.

She began her work teaching at the University of Chicago but left because she didn’t see a future for herself there. She believed that she would never receive tenure simply because she was a woman.

I’m happy about the fact that women can get senior jobs now. They’re not being quite as discouraged as I was.

Nancy Grace Roman

In 1959, Dr. Roman became NASA’s first chief of astronomy. She traveled across the country, speaking to astronomers and giving lectures. She spoke of the advantage of observing the stars from outer space: no light pollution, no clouds, and no atmosphere to block parts of the signal. Most importantly, however, she spoke about and lobbied for the Hubble Space Telescope.

Dr. Roman spoke to secure funding for the project. She pushed for designs to be drawn. Her work has earned her the title “the Mother of Hubble.” And yet, very few people have heard of her.

It wouldn’t be until 1990, after her retirement, that she would see her efforts launched into orbit. 

Nancy Grace Roman, later in life. Source: NASA

Dr. Nancy Grace Roman died in 2018 at the age of 93. A fantastic scientist, inspirational woman, and passionate person, her legacy lives on in our beloved Hubble Space Telescope.

Dr. Roman did everything she could to help the Hubble Space Telescope project. Who knows where it would have gone without her? But Dr. Roman is largely forgotten. Time is washing her memory into oblivion. We must keep Dr. Roman and every other influential woman in history alive. I, among others, must write about her. You must talk about her. We must remember her.

To read about more women in science, check out the links below:

July Sky Spotlight

Astronomy and Physics, Earth, News

2nd – New Moon, Total Solar Eclipse

July will start off as strong as June did! On only the second day of the month, we will have a total solar eclipse. Most of South America will be able to see at least a partial eclipse. Check Time and Date to see if you’re in the path!

3rd – Moon with Mars and Mercury

Astronomers call the sliver after a new moon a young moon. July’s young moon will be hanging out with Mars and Mercury in the constellation Cancer.

4th – Earth at Aphelion

The Earth’s orbit around the Sun is not a perfect circle, it’s an ellipse. This means that at some point, it must be at it’s furthest point from the Sun. That is in July! Aphelion is when a planet is farthest from it’s sun. This won’t affect our life at all, it’s just a neat fact.

9th – First Quarter, Saturn at Opposition

On July 9th, the Moon will be in it’s first quarter phase. This means that the left half will be dark and the right half will be light.

In addition, Saturn will be at opposition. This means that Earth will be directly between Saturn and the Sun.

13th – Moon with Jupiter

Jupiter and the Moon will be together in the constellation Scorpius in the Southern sky.

15th – Moon with Saturn

Saturn will be just East of the nearly full moon. They will be together in the constellation Sagittarius in the Southern Sky.

16th – Full Moon, Partial Lunar Eclipse

Most of the world (not including North America) will be able to see the Partial Lunar Eclipse! Check Time and Date to see if you’re in the path. If, like me, you are not in the path, enjoy the bright, beautiful full moon.

20th – Moon with Neptune

The Moon will be with Neptune in the constellation Aquarius in the Eastern night sky.

24th – Last Quarter, Moon and Uranus

On the 24th, the Moon will be in it’s last quarter with Uranus. They will be in Aries.

28th – Southern Delta Aquariid Meteor Shower Peaks

From midnight to dawn, and especially at 2 a.m., we will be able to see meteors originating from Aquarius. The moon will be a dark crescent, so the meteors will be easier to see. It is more visible from the Southern hemisphere than from the Northern Hemisphere.

31st – New Moon

Finally, on the last day of the month, we will end the same way we began: with a new moon.

Happy July viewing!

Seeing Distant Planets

Astronomy and Physics, Beyond, News

As always, the Hubble Space Telescope is looking to the stars for new exciting sights. Images of swirling galaxies are extremely common. On June 3, 2019, the Hubble Space Telescope released this photo of two exoplanets orbiting a distant star―an incredibly uncommon sight.

The system is called PDS 70 and is located in the constellation Centaurus. Less massive but larger than our sun, the star, also called V1032 Centauri, is a K5 type. K5 stars are cooler and dimmer than our sun. PDS 70 is 370 light-years from the Earth. That’s over 2.17 quadrillion (2,170,000,000,000,000) miles (3.5 quadrillion kilometers)!

In the image below, the white star represents the location of V1032 Centauri. To the left is PDS 70 b and to the right is PDS 70 c.

Exoplanets PDS 70 b and c. Source: ESO and S. Haffert (Leiden Observatory)

Right now, the only way astronomers know how to find planets is by observing the light from the stars. If there is a regular periodic dip in the signal, astronomers can infer that something is passing in front of it. Anything large enough to do this is probably a planet. While this is helpful, a measurement taken from this far leaves lots of room for error.

These planets were first imaged using the Very Large Telescope in Chile. We know that PDS 70 b is 4 to 17 times as massive as Jupiter, while PDS 70 c is 1 to 10 times as massive. The large range in these estimates is a consequence of the lack of precision in the measurement.

Astronomers are rarely able to get images like this because the stars are so big and bright and the planets are small and dim. Star light completely conceals anything coming from a distant planet. In the image above, astronomers cancelled light from the star to reveal the planets.

Once again, the Hubble Space Telescope dazzles us with the cosmos. We will have to wait to see what new sights they excite us with next time!

June Sky Spotlight

Astronomy and Physics, Earth, News

June is finally here! There’s a lot of exciting sights in the sky this month. Unfortunately, Mars and Venus will not be in their best viewing location; both planets rise in the morning and set in the afternoon and evening. Luckily, however, Jupiter and Saturn will be quite visible! These planets will rise in the evening and set in the morning.

June 2nd: Solar Eclipse

On June 2nd, there will be a solar eclipse that will be able to be seen from parts of the Southern Hemisphere! You can search Time and Date’s path map to see if you’ll be able to view it!

Total solar eclipse. The Sun’s cornea is only visible from Earth during a solar eclipse. Source: NASA

A solar eclipse occurs when the Moon is in between the Sun and the Earth. The Moon’s orbit is tilted around the Earth, so every new moon doesn’t produce an eclipse. Totality (when the Moon completely covers the Sun) will occur at 19:22:57 UTC.

June 3rd: New Moon

New month, new moon! New moon is the first phase of the Moon. When the Moon is in its new moon phase, it can’t be seen very well. In addition, we will experience a spring tide, meaning the high tides will be extra high, while the low tides are extra low. The Moon will be near the Sun in the constellation Taurus.

June 10th: First Quarter and Jupiter Closest Approach

First Quarter is when the right half of the Moon is lit up, while the left side is shrouded in darkness. The Moon will be on the western edge of Virgo. First Quarter also brings a neap tide. A neap tide is when the difference between the high and low tides is at a minimum.

Also on June 10th, Jupiter will be as close to Earth as it gets for a while. It will appear bigger and brighter! Furthermore, Jupiter will be directly opposite the Sun. Jupiter will be in between Scorpius and Sagittarius in the eastern sky.

June 16th: Moon and Jupiter Together

On June 16th, a nearly-full Moon and Jupiter will be together in the sky. They will be in between Scorpius and Sagittarius in the eastern sky.

June 17th: Full Moon

The full moon will be right above Sagittarius in the east. A full moon is when the side of the Moon facing us is totally lit by the Sun. The June full moon is known as the Strawberry Moon. They call it the that because June is the start of strawberry season. There will be another spring tide.

June 18th: Moon and Saturn Together

If you look to Sagittarius in the east on June 18th, you will see the Moon and Saturn together in the sky. Saturn will be directly above the bright moon, so it may be difficult to spot.

June 21st: Summer Solstice

June 21st is the Summer Solstice! The summer solstice is the longest day of the year in the Northern Hemisphere, and the shortest in the Southern. This is due to the axial tilt of the Earth.

June 23rd: Moon at Apogee

On June 23rd, the Moon will be at apogee. Apogee is when the moon is farthest from the Earth. The Moon’s orbit is elliptical enough to create a noticeable difference between apogee and perigee (when it’s closest to the Earth). You can see the tiny moon if you look to Aquarius.

Source: Muzamir Mazlan at Telok Kemang Observatory, Port Dickson, Malaysia.

June 25th: Last Quarter

The moon will be in last quarter on June 25th. The last quarter is when the left side of the moon is lit, while the right is completely dark. The last quarter will be in the constellation Pisces. There will be another neap tide.