1. Black holes are regions of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. There size can vary in size, but typical one is 10 times the size of sun.
2. The moon is the brightest object in the sky but gives off no light of its own but reflects light off the sun. Its much smaller than Earth and is only 27% of its radius. The light parts of the moon were flooded by lava when volcanoes erupted millions of years ago.
3. Dwarf planets are Pluto, Eris, Make make, and Haumea. They orbit the sun just like other planets. Most of them are in the Kuiper Belt.
4. Milky Way Galaxy is the home of the Solar System and 200 billion other stars and their planets. Its a giant and has almost one trillion solar masses.
5. Search for aliens (SETI) is a program that searches for aliens. They are trying to figure out if there is life on any other planets. Many people thinks that it has something to do with God and his angels.
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