1.What is true of spiral galaxies?

1.What is the Great Wall?

Most galaxies in the Local Group are:

That quasars were at cosmological distances yet appeared like ordinary faint stars meant:

The Tully-Fisher relation exists between the galaxy’s luminosity and its

Change the date to July 5, 2009. What is the approximate angular separation between the star Antares and the Moon on this date?

Density waves may explain

The compass direction points (N, NW, W, SW, S, SE, E, NE) are marked along the horizon in Starry Night. Change the direction you are facing until the gaze display shows an Azimuth (Az) of 315 degrees. What compass direction are you facing?

What was the best time for viewing Jupiter from Toronto, Canada on the night of July 4/5, 2009?

The Galactic Year is the time for our solar system to orbit the Galaxy; it is about