A __________ telescope uses a curved mirror to gather light.

A telescope that uses a convex lens to concentrate light is a ________ telescope.

A huge __________ telescope is often a collection of smaller telescopes that work as one.

A __________ is any small object that orbits a larger object.

A __________ uses exhaust to propel itself.

A(n) _________ is a reusable spacecraft that transports people and materials to and from space.

A lander touches down on a planet’s surface and sometimes releases a robotic __________.

Life that originates outside Earth is nonhuman.

All known life-forms need liquid water, organic molecules, and a source of energy.

Astronomers have detected no planets outside the solar system.

Not all of NASA’s missions are to other planets, to other moons, or to look at stars and galaxies.

Earth-observing space probes are launched into orbit by NASA and space agencies around the world.

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