Universe

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Across
  1. 3. is the sun and everything that orbits around it. It includes the planets and their moons as well as numerous asteroids and comets. These objects are all held in orbit around the sun by the sun's strong gravity.
  2. 6. is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time.
  3. 7. is the distance light travels in one Earth year.
  4. 8. is a large barred spiral galaxy. All the stars we see in the night sky are in our own
  5. 9. is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
Down
  1. 1. represents the mean distance between the Earth and our sun
  2. 2. is the distance to an object whose parallax angle is one arcsecond.
  3. 3. some type of galaxy
  4. 4. refers to the shape of an ellipse, which is an elongated circle, stretched into an oval.
  5. 5. is how astronomers explain the way the universe began.