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A large building with a powerful telescope used for studying stars and planets.
observatory
A tiny piece of matter, even smaller than an atom.
particle
A man-made object that orbits Earth or another celestial body.
satellite
Powered by the sun, like solar energy or solar panels.
solar
A large spacecraft in orbit around Earth where astronauts can live and work for long periods.
space station
A pressurized suit worn by astronauts to protect them in space.
spacesuit
The outside layer of something, like the surface of the Earth or the moon.
surface
An instrument with lenses that allows us to see distant objects in more detail.
telescope
Living or happening on land, on Earth.
terrestrial
From outside Earth, possibly from another planet or space.
Extraterrestrial
A scientific theory explaining the origin of the universe from a hot, dense state.
the Big Bang Theory
Everything that exists, all of space and time, and all matter and energy.
universe
A complete absence of matter, a perfect emptiness.
vacuum
The state of not experiencing gravity, feeling light and floating.
Weightlessness
