Star magnitude defined. How celestial objects are named. Help for using Sky-Spy Safari. Go to Flash version.
Quick start: Click on the celestial targets to the right. A new window will open allowing you to select between three different NASA telescopes to view the object. Click 'help' above for more information
Planisphere to choose celestial objects. How telescopes work.
Go to NASA homepage. Go to NASA new vision page.
M16 Nebula M20 Nebula M49B Nova M15 Star Cluster Super Nova 1604 M57 Nebula M101 Galaxy M51 Galaxy M87 Galaxy M31 Galaxy M81 Galaxy M74 Galaxy M45 Star Cluster M1 Nebula M42 Nebula