Describe spiral arms
What will be an ideal response?
Our Galaxy contains more than 100 billion stars, and, like many others, has graceful spiral arms winding outward through the disk. Spiral arms are long spiral patterns of bright stars, star clusters, gas, and dust. Stars are born in great clouds of gas and dust as they pass through the spiral arms.
You might also like to view...
Spherical Mirrors: Single convex spherical mirrors produce images that
A. are always smaller than the actual object. B. are always larger than the actual object. C. are always the same size as the actual object. D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object. E. are sometimes real.
Which of the following best explains what scientists think happened to outgassed water vapor on Venus?
A) Ultraviolet light split the water molecules, and the hydrogen then escaped to space. B) Water was removed from the atmosphere by chemical reactions with surface rock. C) It is frozen as water ice in craters near the poles. D) It turned into carbon dioxide by reacting with nitrogen in Venus's atmosphere.
The sodium salt of a fatty acid is known as a(n) ______________
Fill in the blank(s) with correct word
________ is the smallest of the terrestrial planets.
A. Mercury B. Earth C. Venus D. Pluto E. Mars