A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy than a spiral galaxy.

According to the Hubble Law, a galaxy with a velocity of 25,000 km/s will be:

Why is the spectral sequence of stars not alphabetical? 

Both photos show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?

The red evolutionary track illustrated in the figure above (similar to fig 19.6 in your textbook), that goes from point 4 to 5 to 6 to 7 shows:

Cluster ages can be determined from

  This painting represents the Sun and planets (and two dwarf planets) of our solar system. What is not to scale in this painting?

Why do we think the first generation of stars would be different from stars born today?

A spacecraft is on a trajectory that happens to be taking it near a black hole. Which diagram shows how the spacecraft’s orbit will be affected?

About how many stars can be seen from somewhere on Earth with the naked eye?