Astrohphysics Ks3

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9 Terms

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universe
includes all space
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galaxy
large group of stars held together by gravity
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solar system
a group of planets orbiting a star
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is the sun the biggest star?
no.
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1 astronomical unit
1\.5 x 10^8 km
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orbital speed
(2 x pi x orbital radius) / time period
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geostationary satellite
takes 24 hours to orbit the earth, always stays above the same point on earth
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list the colours of stars from coldest to hottest
red, orange, yellow-white, white, blue-white, blue
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star
a body that emits energy powered by nuclear fusion