Universe Test Review

What shape are all stable orbits?

• Circles

• Ellipses

• Rectangles

• Round

Which of Kepler's Laws has to do with the shape of orbits?

• 1st

• 2nd

• 3rd

Which of Kepler's Laws has to do with the time it takes to complete a full orbit?

• 1st

• 2nd

• 3rd

Which of Kepler's Laws has to do with the speed of an object while it is orbiting?

• 1st

• 2nd

• 3rd

Which of these 4 planets has the longest period (year).

• Mercury

• Venus

• Earth

• Mars

Pictured here is a comet orbiting the Sun. At which point in the comet's orbit is it moving the slowest?

• A

• B

• C

• D

• E

Which star is moving away from our solar system?

• Star A

• Star B

• The Sun

Use the chartto find the identity of the unknown element.

• beryllium

• copper

• manganese

• strontium

• titanium

All four of these stars have identical spectra and are in motion relative to earth. The dashed lines represent where the absorption lines would be if the stars were at rest. Which star is moving the fastest relative to us?

• Star A

• Star B

• Star C

• Star D

What does a star have to do to be considered a star? (What makes a star a star?)

• Be the brightest object in its area

• Combine smaller elements into bigger elements through nuclear fusion

• Tear bigger elements apart into smaller ones through nuclear fission

• Be famous