In our solar system there's planets, asteroids, comets, meteors and stars.
the fusiion of hydrogen nuclei is the source of the sun's energy.
If a massive asteroid collides with the earth, the dust from the collision could rise up into the earth's atmosphere and block out the sun, this could cause plants to die and in further effect animals to die.
Light travels at a very high speed.
Distant objects in the universe are observed as younger than they are now (the light that is reaching us now is from thousands of years ago).
The sun is a star in the milky way galaxy.
All chemical elements with more mass than helium where made in earlier stars.
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