The sidebar is composed of various Chandra AO-1 images, most of which are posted on the Chandra photo album site. Click on an image to go to the Chandra page featuring further explanation of that image.
This is an x-ray image of Cassiopeia A (Cas A) - a supernova remnant, observed by Chandra on August 19, 1999.
Credit: NASA/CXC/SAO/Rutgers/J.Hughes.
This picture is from the Astronomy Picture of the Day webpage, and was originally posted there on 11 January 2001. This is a planetary nebula known as NGC 6543, or the Cat's Eye nebula. The image is actually a composite of optical (Hubble) and X-ray (Chandra) observations.
Credit: NASA / X-ray: Y. Chu (UIUC) et al.,
Optical: J. P. Harrington, K. J. Borkowski (UMD), Composite: Z. Levay (STScI).
This is a Chandra image of the supernova remnant known as E0102-72 (no one ever said astronomers here overly clever at naming things).
Credit: NASA/CXC/SAO.
This is a Chandra image of a luminous blue variable star, Eta Carina.
Credit: NASA/CXC/SAO.
This image is of the central region of a compact galaxy group called HCG 62.
Credit: X-ray: NASA/CfA/J. Vrtilek et al.
This is an image similar to the Hubble Deep Field image (HDF, on the left above) that caught the world's attention several years ago. Like the HDF, the Chandra Deep Field (CDF; on the right above) was taken by doing long, summed exposures of the same area of the sky, and allows astronomers to further and fainter objects in X-ray than ever before.
Credit: NASA/PSU/G.Garmire, N.Brandt, et al.
The Crab Nebula is a supernova remnant with a pulsar at its core. The pulsar is the only one, so far, to be seen to pulse in all observable wavelengths, from radio to gamma ray. This is a Chandra image of the Crab.
Credit: NASA/CXC/SAO.
