Take Flight with the Crossley ID Guide: Sunrise, Sunset
Updated: 2012-12-18 18:10:09
: , New in Print March Mathness Election 101 PUP Home Blog Dec 18 2012 Take Flight with the Crossley ID Guide : Sunrise , Sunset by Jessica Pellien Filed in : Birds and Natural History The Crossley ID Guide Twitter 9:00am EST Click on the photo above to view a larger . image One of the benefits of having so many plates devoted to one group of birds is that The Crossley ID Guide : Raptors can portray how raptors look in different types of . light Have you ever noticed that birds look orangey at sunup or sundown This can be confusing when trying to ID raptors based on their coloration . Be aware of this , and rely on plumage traits that are not color-related to make accurate IDs . The ability to see patterns as shades of gray” helps . And of course , structure and manner of flight are always
Some of the biggest black holes in the Universe may actually be even bigger than previously thought, according to a study using data from NASA's Chandra X-ray Observatory.
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This composite image shows the spiral galaxy NGC 3627, located about 30 million light years from Earth.
NGC 922 was formed by the collision between two galaxies - one seen in this image and another located outside the field of view.
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A jet of X-rays from a supermassive black hole 12.4 billion light years from Earth has been detected by NASA's Chandra X-ray Observatory. This is the most distant X-ray jet ever observed.
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These images of the planetary nebula Abell 30, (a.k.a. A30), show one of the clearest views ever obtained of a special phase of evolution for these objects.
The Milky Way and other galaxies in the universe harbor many young star clusters and associations that each contain hundreds to thousands of hot, massive, young stars known as O and B stars.
One of the lowest mass supermassive black holes ever observed in the middle of a galaxy has been identified, thanks to NASA's Chandra X-ray Observatory and several other observatories. 
This gallery shows four planetary nebulas from the first systematic survey of such objects in the solar neighborhood made with NASA's Chandra X-ray Observatory.
Astronomers have used NASA's Chandra X-ray Observatory to find evidence our Milky Way Galaxy is embedded in an enormous halo of hot gas that extends for hundreds of thousands of light years.