space search

6. A gigantic cluster of 4 to 25 clusters of galaxies that is hundreds of millions of light-years in size
8. the study of the universe
10. CMB The radiation left over from the big bang, which fills the universe
15. The time it takes for an object to orbit another object; Earth's revolution around the SUn is 365.25 days
17. the effect in which objects moving toward an observer have their wavelengths shortened, toward the blue end of the visible spectrum
18. Any object that exists in space, such as a planet, a star, or the Moon
19. the small group of about 40 galaxies that includes the Milky Way
20. A group of stars that seem to form a distinctive pattern in the sky

1. The turning of an object around an imaginary axis running through it
2. The brightness of a star as seen from Earth
3. A way of showing days, organized into a schedule of larger units of time, such as weeks, months, seasons, or years; usually a table or a chart
4. A scientist who studies astronomy, which is the study of the night sky
5. a collection of stars held together by gravity
7. the galaxy that includes the solar system; appears as a hazy white band in the night sky
9. The event that may have triggered the expansion of the universe 14 billion years ago
11. the change in pitch of a sound due to the motion of the source relative to an observer;also, the change in frequency of a light source due to its motion relative to an observer
12. a huge collection of stars, planets,gas, and dust that is held together by gravity
13. The distance that light travels in one year, about 9.5 x 1012km
14. The effect in which objects moving away from an observer have their wavelengths lengthened, toward the red end of the visible spectrum
16. a collection of 100 000 to a million stars that is arranged in a distinctive spherical shape; globular clusters are around the center of Milky Way