Our ____, Earth, orbits the sun, which is a star in our ____. There are ____ planets in our solar system, all orbiting the sun together. Earth has an ____, a layer of air around it, which helps us breathe and stay warm. Our solar system is part of a huge galaxy called the ____ There are many galaxies in the ____, each with its own stars and planets. ____ are curious about what’s out there. Could there be life, or ____, on other planets? To find out, we search for clues by studying ____ from space. A ____, made of ice and rock, is one object in space that moves through our solar system, taking a long ____ around the sun. To learn more about space, we send rockets and ____ on missions. Sometimes, astronauts travel in a rocket to the space station, where they work and ____ with scientists on Earth. A spacecraft collects data, like pictures and sounds, to help us learn. Each mission brings us closer to understanding if we can one day find ____ or communicate with it.

UNIT 4: Exploring Space

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