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27 Results for "gravity"

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Find out why a ball thrown in the air will return to the ground. 
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Gravity is the force of attraction between all objects in the Universe. Objects with more mass have greater gravitationa...
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Mass and weight may seem like the same thing, but in fact these two measurements are very different. Mass is the total a...
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What would happen if you were to place a bowling ball on top of a nice fluffy pillow? The mass of the bowling ball would...
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Many historians consider English scientist Sir Isaac Newton the first modern physicist. He explained how gravity affects...
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A galaxy is a giant, spinning object made of gas, dust, and stars held together by gravity. Galaxies come in different s...
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Most mass in the universe is not normal matter we can see, like stars, planets, and puppies. In fact, 80% of the mass is...
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Albert Einstein made many great contributions to science that include the Special Theory of Relativity and the General T...
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Albert Einstein was a Nobel Prize-winning physicist who changed the way we think about our world and our Universe.
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Since the 1920s, observations of distant galaxies reveal that our universe was expanding.
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A solar system is made up of a star and everything that travels around it. Solar means "of the sun.
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A black hole is a collapsed star. When high-mass stars use up all their fuel, their cores collapse inward. The heaviest ...
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In college, Mordecai-Mark Mac Low decided to take science classes that looked like fun. So he chose astrophysics, which ...
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Scientists believe that everything in the Universe began about 13 billion years ago in a giant explosion called the Big ...
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A star is a huge glowing ball of hot gas. Deep inside its core, hydrogen atoms smash together, forming helium and releas...
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Galileo was a "jack of all trades." He was a musician, a philosopher, a physicist, and an astronomer. He is best known f...
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Comets are like "dirty snowballs" that have orbited the Sun since our Solar System formed, billions of years ago. A come...
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You have to be a really big thinker to imagine the size of the Universe.
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Asteroids are space rocks that have existed since the formation of the planets over 4.6 billion years ago. Scientists be...
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Einstein might never have become a worldwide celebrity had it not been for the English astrophysicist Arthur Eddington.
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Thousands of years before the Aztecs, a native people called the Zapotec founded one of Mexico's earliest civilizations ...
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The smallest and most distant of the "gas giant" planets. Neptune has much in common with its three huge neighbors Jupit...
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The Milky Way is the galaxy in which our Solar System lives. There are more than 200 billion stars in our spiral galaxy,...
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Considered a pioneer in astronomy, Johannes Kepler is best known for his three laws of planetary motion.
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Energy is the ability to do work. Scientists define "work" as when a force moves something. When you lift a brick, you a...
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Meteorites and asteroids have bombarded the Moon for billions of years, leaving deep craters on its surface.
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Ninety-three million miles from Earth, a giant ball of hot gas brightens the sky. Nuclear reactions in the Sun's core cr...