Objects used to map spiral arms are called spiral _______________
Fill in the blank(s) with correct word
tracers
You might also like to view...
A block of wood is floating in water with 2/3 of its volume below the water line. The density of the wood is
A. equal to 3/2 the density of water B. equal to 2/3 the density of water C. equal to 1/3 the density of water D. equal to the density of water since it is floating
What man-made object exceeded the speed of sound long before the invention of the airplane or the bullet?
What will be an ideal response?
Orographic lifting occurs as
A) two air masses meet head on. B) air moves over a warm ground surface. C) an air mass moves into a rain shadow. D) an air mass is pushed over a mountain range.
Stars that have ejected a planetary nebula eventually become
a. protostars. b. brown dwarfs. c. white dwarfs. d. red giants.