Every year the moon moves about 3.8cm further away from the Earth. This is caused by tidal effects. Consequently, the earth is slowing in rotation by about 0.002 seconds per day per century. Scientists do not know how the moon was created, but the generally accepted theory suggests that a large Mars sized object hit the earth causing the Moon to splinter off.
If you shouted in outer space, even the person right next to you would not be able to hear what you said. Sound travels as pressure waves through air. Because there is no air in outer space, there is also no sound. So don’t bother trying to tell your astro-buddy his fly is down, he ain’t gonna hear you.
The lack of gravity in outer space combined with the inherent surface tension of liquids causes them to form into free-floating spheres. That’s why astronauts often drink water out of a straw in a tightly sealed container. Although they can suck free-floating water bubbles in the weightlessness of zero-gravity space if they want to!
One problem with working out the age of the Universe is that there are stars in our galaxy which are thought to be 14 to 18 billion years old – older than the estimated age of the Universe. So, either the stars must be younger, or the Universe older.
After spiraling into a black hole is torn apart and glows so brightly that it creates the brightest objects in the Universe – quasars.
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