Any device that detects gravitational waves

distance from the center of one object to the center of the object orbiting it

Calculate: Gravitational force between Earth and the Moon (Moon stats: orbital radius = 3.48 x 10^8 m; mass = 7.35 x 10^22 kg... & answer in 2 SF)

The amount an ellipse deviates from a perfect circle

Based on the belief that the sun is the center of the solar system

Calculate: Period of a comet in Earth years that has an orbital radius 50 times the Earth's

Calculate: orbital velocity of Earth in m/s

Calculate: velocity of gravitational waves in km.hr

Calculate: orbital velocity of Mercury in m/s

the point in the orbit of a satellite at which it is nearest to Earth

Point in a planets orbit where it farthest from the sun

Calculate: Orbital Period of Mars in Earth days (answer in 2 SF)