10c.  

Next, you will be shown a series of images with their explanatory texts. Please respond to the three questions shown after each set of images. To see more details in an image, you may enlarge the thumbnail by clicking on it.

M31

Many consider the Andromeda Galaxy, otherwise known as Messier 31, to be a sister galaxy to our own Milky Way.  It is the closest spiral galaxy to us, at a distance of just 2.5 million light years away.  In fact, it is so close that skywatchers can see it with the unaided eye.  This image of Andromeda in optical light is from the Digitized Sky Survey.  It reveals Andromeda’s majestic spiral arms containing stars, dust, and gas.  Unseen in this image is a supermassive black hole that lurks at the center of the galaxy.  Astronomers have calculated that Andromeda and the Milky Way are destined to collide several billion years from now.

A B
C D


Which image is most pleasing?
ABCD


Which image is most interesting?
ABCD


Which image best conveys the science explained in the text?
ABCD