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Planetary Exploration

Across
The velocity a rocket must achieve to establish an orbit around earth.
Pictures of the surface based on computer data.
A large artificial satellite on witch people people can live and work for long periods.
A feeling of weightlessness
A telescope that uses convex lenses to gather and focus light.
Item that is used on earth but developed from items used for space.
A space craft that can carry a crew into space return to earth and be reused for the same purpose.
A device that expels gas in one direction to move the rocket in the opposite direction.
A picture of a planet taken in visible light, or in another form of electromagnetic radiation.
An object that spreads out light to create different colors.
The distance between the crest of one wave and the crest of the next wave.
Small robots that roam around the surface of planets and other objects.
Down
An object that rotates around the earth at the same rate that the earth does.
A telescope that uses a curved mirror to collect and focus light.
An object that revolves around another object in space.
Collection of information about earth and other objects in space without being in direct contact.
The velocity a rocket must reach in order to fly beyond a planets gravitational pull.
Number of waves within a certain amount of time.
A spacecraft that carries scientific instruments that can collect data but has no human crew.
A place that is void of all matter.
The reacting force that propels a rocket forward is called thrust
Tiny dots that make up pictures.