Astrophysics 2

Planets closer to the sun have a _____________ orbit.

• less curved

• more curved

Comets have a _________ orbit.

• Circular

• Elliptical

Comets get __________ as they approach the sun.

• faster

• slower

A comet has ____ tail(s).

• one

• two

• three

Which law describes the change of gravitational force with distance?

• Inverse proportion law

• Inverse square law

• Exponential law

• Reciprocal law

What is the value of g for 2D?

• 4

• 2

• 1/2

• 1/4

What is the value of g for 3D?

• 6

• 9

• 1/6

• 1/9

What is the value of g for 1/2D?

• 1/4

• 1/8

• 4

• 8

The sun accounts for what percent of the solar systems mass?

• 50%

• 80%

• 90%

• 99%