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

The core of the Milky Way, Sagittarius A, is a strong radio source in the sky.

Right-click (Ctrl-click on a Macintosh) over the Moon in the view and select Magnify from the contextual menu that appears. Then use the Zoom buttons in the toolbar to magnify the Moon until it fills the entire main window. Read the zoom display. Roughly, what is the angular diameter of the Moon?

William Herschel’s original model for our Galaxy was based on counting stars.

For what type of object is the period-luminosity relation used for determining distances?

21. Repetition of phrases or words persistently is referred to as __________.

32. A __________ is characterized by an intense and irrational fear of a specific object or situation.

10.__________ thinking is characterized by literal interpretations without understanding abstract concepts.

18. How would you describe a patient whose outward emotions are absent?

36. Which type of delusion involves the belief that one’s body has a major dysfunction?