Why do sunspots appear dark in pictures of the Sun?
A) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere.
B) They are too cold to emit any visible light.
C) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun.
D) They are extremely hot and emit all their radiation as X rays rather than visible light.
A) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere.
You might also like to view...
The primary difference between the special theory of relativity and the general theory of relativity is that the general theory also describes
A) the nature of gravity. B) length contraction. C) time dilation. D) the constancy of the speed of light.
An object moving in a circle undergoes
a. constant acceleration. b. free fall. c. centripetal acceleration. d. linear acceleration. e. frequency.
Trace fossils are
a. tracks only. b. borings only. c. burrows only. d. all of the above.
A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is _________
Fill in the blank(s) with correct word