Category: Gravity

Spaced Out

5/3/2022

Alexandra Siy

“STEM through the lens”

Do you ever feel spaced-out before you take a test? Yes or no, let’s go!

1.     TRUE or FALSE?
It’s possible for a spacecraft to fly from Earth to Venus, to Mars, back to Earth, then to Saturn, out to Pluto, back to Jupiter, and come home to Earth on one tank of fuel.

2.     It’s possible for a spacecraft to fly all over the solar system on one tank of fuel because of:

a.      the sling-shot effect
b.     gravity assist
c.      swing-by
d.     all of the above
e.      none of the above

            The sling-shot effect, also known as a swing-by or gravity assist, is used to accelerate a spacecraft. Acceleration means to change the speed and/or the direction of a moving body. A spacecraft that is speeding up, slowing down, or following a curved path is accelerating.
            Gravity accelerates objects everywhere in the Universe. When you ride your bike up a hill it takes a lot of effort to make it to the top because the Earth is massive compared to you, and gravity pulls you toward its center. When you coast down the other side, gravity is your friend!
            Spacecraft can use the gravity of a planet to accelerate. Picture a spacecraft falling toward a planet. The spacecraft will crash unless it steers away.

3.     As a spacecraft accelerates toward a planet, the motion of the planet is also affected by the gravity exerted by:

a.     the spacecraft
b.     the Sun
c.     cosmic rays
d.     both (a) and (b)
e.      both (b) and (c)
f.       all of the above
g.      none of the above

            All bodies in space, no matter how big or small, exert gravity on each other. Planets stay in orbit around the sun because of gravity. A planet is also affected by the tiny mass of a spacecraft. Gravity assist was used to increase the speed of Voyager 1 by 36,000 mph on its swing by Jupiter, which sling shot it to Saturn. And Jupiter slowed down infinitesimally, at a rate of 12 inches per one trillion years.

4.     The person who discovered the math for using gravity assist to accelerate a spacecraft from planet to planet to planet…was:

a. Aristotle (384 B.C. to 322 B.C)
b.      Galileo (1564-1642)
c. Sir Isaac Newton (1643-1727)
d.      Katherine Johnson (1918- )
e. Michael Minovitch (1936- )

END OF TEST!
DON’T STOP WORKING.
START TALKING.
ASK QUESTIONS.
GO TO THE LIBRARY TO FIND THE ANSWERS.

In this drawing a spacecraft gets an assist from Jupiter as it "slingshots" toward Saturn. Image courtesy of NASA/JPL

Voyager 1 and Voyager 2 used gravity assist to fly by the outer planets. Image courtesy of NASA

The twin Voyagers have no people on board on their interstellar journey, but carry The Golden Record, which contains messages, music, and pictures from Earth. Image courtesy of NASA/Alexandra Siy

In case you didn't make it to the library: In 1961, UCLA graduate student Michael Minovitch used math and the new IBM 7090-7094 computers to invent gravity assist trajectories for space flight. Used with permission of Michael Minovitch

Alexandra Siy's Voyager's Greatest Hits tells the story of the twin space probes that traveled to Jupiter, Saturn, Uranus, and Neptune, a journey beyond our solar system into interstellar space, where no probe has ventured before. Siy tells the fascinating story of how the Voyager probes work, where the probes have been and what they’ve seen, and what they carry on board.

Alexandra Siy is also a member of Authors on Call. You can bring her to your classroom via interactive videoconferencing and learn more from her and ask her questions. To find out more go here.

MLA 8 Citation
Siy, Alexandra. "Spaced Out." Nonfiction Minute, iNK Think Tank, 2 May 2018,
www.nonfictionminute.org/the-nonfiction-minute/Spaced-Out.

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Isaac Newton's Wonder Years

3/28/2022

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Kerrie Logan Hollihan
Teaching the Power of Wonder

   In spring 1665 a college student named Isaac Newton studied natural philosophy, what we call “science.” Back then, a good student could learn everything to know about the natural world. But plague, the Black Death, came to England. Cambridge University closed. Isaac went home to Woolsthorpe.

            For two years Isaac thought about his studies during four years at university. He’d always been thoughtful—not the best at games, making friends, or minding sheep. But everybody knew Isaac Newton liked to think. Folks told time by the sundial he’d drawn on a wall.

            Home at Woolsthorpe, Isaac’s learning about science and math bubbled up in his head like yeast rising in a loaf of bread.

            So... Newton unplugged. His mind roamed like that of an artist or composer. He was driven by the need to create—not paintings or symphonies, but questions.

            “Why do things always fall down?”

            “Why does the earth move around the sun?

            “Why doesn’t the moon fall onto the earth?”

            “Does everything ‘up there” work like things work ‘down here?’”

            Isaac Newton answered his questions with three science rules, Newton’s Laws of Motion.

            At Woolsthorpe, Newton grappled with the concept of moving objects. He worked out the math to find the area under curves. He called this math fluxions. Today we call this calculus, useful for launching rockets or tracking TV signals.

            Once back at Cambridge, Newton said nothing until he read someone else’s paper on fluxions. Newton published a better paper. Soon he was Cambridge’s top math professor.

            Isaac Newton wondered another twenty years. He played with prisms in a dark room and theorized that white light comprises the visible spectrum of red, orange, yellow, green, blue, indigo, and violet. He practiced alchemy and chemistry, looking for the legendary philosopher’s stone to turn base metals to gold. In 1687, Newton published our most important science book, the Principia.

            In the Principia, Newton showed how laws of gravity and motion work the same at great distances—far off in space, or in your classroom. We accept these ideas, but in 1687 many still had medieval beliefs that sun, moon, planets, and stars all traveled in their own crystal spheres.

            Yes, Newton wondered about A LOT:

Gravity
Forces
Mass
Inertia
Math
Motion
Light
God
???

Whatever interests you, I hope you’ll think about it—a lot! Like Isaac Newton, take time to WONDER!

Sir Isaac Newton was an English mathematician, astronomer, theologian, author and physicist who is widely recognized as one of the most influential scientists of all time and a key figure in the scientific revolution. Based on a portrait by Godfrey Kneller, 1702, via Wikimedia Commons

Sir Isaac Newton's own first edition copy of his Philosophiae Naturalis Principia Mathematica with his handwritten corrections for the twentieth edition. Photograph Andrew Dunn via Wikimedia Commons

Trinity College, the part of the University of Cambridge where Newton worked and lived. Library of Congress

This statue of the young Isaac Newton stands at the Oxford University Museum of Natural History. Look carefully around his feet for a hint on what he is wondering about. If you can’t figure it out, then read about Newton and gravity.
Wikimedia Commons

Featuring 21 hands-on projects that explore the scientific concepts Isaac Newton developed, Kerrie Logan Hollihan's Isaac Newton and Physics for Kids paints a rich portrait of the brilliant and complex man and provides readers with a hands-on understanding of astronomy, physics, and mathematics. A time line, excerpts from Newton's own writings, online resources, and a reading list enhance this unique activity book.

MLA 8 Citation
Hollihan, Kerrie Logan. "Isaac Newton's Wonder Years." Nonfiction Minute, iNK
Think Tank, 21 Feb. 2018, www.nonfictionminute.org/the-nonfiction-minute/
isaac-newtons-wonder years.

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Music That's Out of This World

3/18/2022

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Amy Nathan
Stories that Surprise and Inspire

When musicians play a lively tune, they often find themselves spontaneously tapping their toes and moving about to the pulsing beat. But when Ellen Ochoa played her flute at work one day in 1993, she couldn’t be spontaneous at all. If she hadn’t made careful plans, she could have been blown about the room, just by playing one long note on her flute. That’s because she was an astronaut working on the U.S. Space Shuttle as it circled Earth more than a hundred miles out in space.

      Gravity is so weak far out in space that astronauts—and any of their gear that isn’t fastened down—will float about inside a space craft. Blowing air into her flute could have created enough force to actually send Ochoa zipping about the space shuttle cabin. So, to keep herself in place as she played, she had to slip her feet into strong loops attached to the floor.

      Dr. Ochoa, now the director of NASA’s Johnson Space Center, was the first U.S. astronaut to bring a flute on a space mission, but she wasn’t the first to make music in space. Nearly thirty years earlier, in December 1965, two astronauts onboard the Gemini 6 space craft played a musical joke on mission control officials down on Earth. Those astronauts—Walter M. Schirra, Jr., and Thomas P. Stafford—told mission control that they saw an unusual object near their spaceship, a satellite perhaps, moving from North to South. They said they would try to pick up some sound from this mysterious object. Then they used the harmonica and bells they had secretly brought with them on that December mission to surprise folks listening down below by playing “Jingle Bells.”

      In recent years, other astronauts have brought musical instruments on space missions to help lift their spirits, especially those who spend many months on the International Space Station. Like Dr. Ochoa, these astronaut musicians have to make adjustments, such as using a bungee cord to attach an electronic piano keyboard to a pianist’s leg.

Some astronauts have composed music in space, including Canadian Chris Hadfield. On May 6, 2013, he sang the song he wrote—called “I.S.S. (Is Somebody Singing)”—in a live TV broadcast from the space station as thousands of Canadian schoolchildren sang along with him down on Earth. Click here for a recording of that space-to-Earth performance

Dr. Ellen Ochoa playing her flute on board the U.S. Space Shuttle. Courtesy of NASA

Walter M. Schirra, Jr. Courtesy of NASA

Thomas P. Stafford. Courtesy of NASA

Chris Haddfield. Courtesy of NASA

Learning to play an instrument can be fun and, at times, frustrating. Amy Nathan's lively book helps young people cope with the difficulties involved in learning a new instrument and remaining dedicated to playing and practicing. Teens from renowned music programs - including the Juilliard School's Pre-College Program and Boston University's Tanglewood Institute - join pro musicians in offering practical answers to questions from what instrument to play to where the musical road may lead. For more information, click here.

MLA 8 Citation
Nathan, Amy. "Music That's Out of This World." Nonfiction Minute, iNK Think
Tank, 11 May 2018, www.nonfictionminute.org/the-nonfiction-minute/
Music-Thats-Out-of-This-World.

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"Ride, Sally, Ride!"

3/12/2020

1 Comment

Jim Whiting
The Running Encyclopedia

In 1983, shortly before she became America’s first female astronaut to participate in a mission, Sally Ride faced a press conference. Reporters raised questions they would never have asked a man. “Will the flight affect your reproductive organs?” one inquired. “Do you weep when things go wrong on the job?” queried another. A third wondered, “Will you wear makeup and a bra in space?” Tonight Show host Johnny Carson joked that the flight was delayed because Sally had to find a purse that matched her shoes.

It wasn’t just U.S. media. The Soviet Union had already sent two women into space. When one of them arrived at the space station, a male cosmonaut (the Soviet term for astronauts) said, “An apron is waiting for you in the kitchen.”

By this point, Sally had mastered parachute jumping, water survival, coping with weightlessness and the massive G-forces from a rocket launch, and other highly demanding skills. She flew jet planes. She had a Ph.D. degree in physics from Stanford, one of the nation’s top universities. She helped develop a robotic arm for use on the space shuttle. She was a nationally ranked tennis player who decided not to turn pro because she preferred science.

The general public seemed more accepting. On launch day at Florida’s Cape Canaveral, thousands of people wore “Ride, Sally, Ride!” T-shirts, from the lyrics of the pop song “Mustang Sally.”

The mission went flawlessly, and Sally flew again the following year. She was scheduled for a third flight in 1986, but it was scrubbed when the Challenger space shuttle blew up.

Sally left the space program soon afterward. She was passionate about encouraging young people—especially girls—to become involved in STEM (Science, Technology, Engineering, Math). Here are some of the things she did toward that achieving that goal.

She originated the Sally Ride EarthKam project, in which middle school students request that astronauts take photos of any point on Earth. Students research features in the images to provide additional material for subjects they are studying.
Her company Sally Ride Science offers programs encouraging STEM studies.
Sally Ride Science Camps for Girls provide week-long immersions in science.
Sally Ride Science Festivals bring hundreds of students together in day-long celebrations of science.
She wrote seven children’s books about the Earth and various aspects of space travel.

Sadly, Sally Ride died of cancer in 2012 at the age of 61. Shortly afterward, President Barack Obama awarded her the Presidential Medal of Freedom. It is the nation’s highest civilian honor.

On June 18, 1983, Sally Ride became the first American woman in space as a crew member on space shuttle Challenger. Here she communicates with ground controllers from the flight deck during the six-day mission. U.S. National Archives

Sally Ride while promoting the Sally Ride Science Festival at UCSD in 2006. Wikimedia

To find information on many of Jim Whiting's books, click here.

MLA 8 Citation
Whiting, Jim. "'Ride, Sally, Ride!'" Nonfiction Minute, iNK Think Tank, 14 May
2018, www.nonfictionminute.org/the-nonfiction-minute/Ride-Sally-Ride.

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Spaced Out

Isaac Newton's Wonder Years

Music That's Out of This World

"Ride, Sally, Ride!"

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