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7 Cards in this Set

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How much is one astronomical unit?
=150,000,000 km
one light year?
=speed of light*60sec/min*60min/hr*24hrs/day * 365 days/year.
what causes the seasons?
the angle of the earths axis causes it.
what is a refractor telescope?
it makes images with a lens
what is a reflecting telescope?
the only difference in this telescope is that it has a mirror
ccds are usefull in what way to a telescope?
they can be used to take high resolution pictures; and data
what are large telescopes usefull for?
one, they have better resolution, two they gather more light allowing study of very faint sources