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The Footprints on the Moon Will Be There for 100 Million Years 

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The Footprints on the Moon Will Be There for 100 Million Years 

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The Moon has no atmosphere, which means there is no wind to wear down the surface and no water to wash the footprints off. Since there is no atmosphere, that means the footprints of the Apollo astronauts, spacecraft prints, rover-prints, and discarded material will be there for millions of years.

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In 3.75 Billion Years the Milky Way and the Andromeda Galaxies Will Collide

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In 3.75 Billion Years the Milky Way and the Andromeda Galaxies Will Collide

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The Andromeda Galaxies are slowly moving in the direction of the Milky Way, which means the Andromeda Galaxies are moving toward our solar system. The Andromeda Galaxies are approaching our solar system at a rate of 110 kilometers per second, (68 mi/s) and in approximately 3.75 billion years the two will collide and form an abundant elliptical galaxy.

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If Two Pieces of the Same Kind of Metal Touch in Space They Will Permanently Form Together 

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If Two Pieces of the Same Kind of Metal Touch in Space They Will Permanently Form Together 

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This fact is also known as cold welding and it happens because the atoms of two pieces of metal have no way of knowing they are separate. This doesn’t happen on Earth because the air and water found between the pieces of metal.

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Astronomers have found a massive water vapor cloud which holds 140 trillion times the mass of water in the Earth’s oceans. This water vapor cloud is located somewhere around 10 billion light years away - making it the largest discovery of water ever found.

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The theory is that when Earth was a relatively young planet, it was truck by a giant object and this collision broke a piece of the Earth away to create the moon. The piece then began to orbit the Earth as a result of its gravitational pull.

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The Sun’s Mass Takes Up 99.86% of the Solar System

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The Sun’s Mass Takes Up 99.86% of the Solar System

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Made of three quarters hydrogen and helium for the most of its remaining mass, the Sun accounts for 99.86% of the mass in our solar system with a mass around 330,000 times that of Earth.

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A black hole is a place in space where gravity pulls so much that even light can’t get out. The gravity is so strong that matter gets trapped inside the black hole’s space. This can happen when a star is dying, and its light is burning out.

Despite no light being able to escape a black hole’s gravitational pull and being trapped inside of it, people (the naked eye) can’t see black holes. They’re invisible. But, space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.

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Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the star into space.

Scientists think supermassive black holes were made at the same time as the galaxy they’re in.

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If Black Holes Are “Black,” How Do Scientists Know They Are There? 

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If Black Holes Are “Black,” How Do Scientists Know They Are There? 

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A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.

When a black hole and a star are close together, high-energy light is made. The kind of light can not be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.

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Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are a minuscule but have the mass of a large mountain. That fact may not be believable when first heard, but mass is the amount of matter in an object.

Another black hole is called “stellar.” Its mass can be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth’s galaxy, the Milky Way!

The largest black holes are called “supermassive.” These black holes have masses that are more than 1 million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky way galaxy is called Sagittarius A. It has a mass equal to about 4 million suns.

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This residual radiation is known as cosmic background radiation from microwaves. The chemistry of life could have started shortly after the Big Bang, 13.8 billion years ago, at a time when the universe was only 10-17 million years old.
The best-supported theory of our universe’s origin centers on an event known as the big bang.

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