Category: NASA


NASA Emission Nebula

“A Nebula By Any Other Name

An apparent spammer in his comment on a post of mine mentioned that he was having trouble getting the RSS feed to work so I am not only testing the link but the apparent spammer as well. It is probably an attempt to get me to click on his site link and bypass the normal spam blocking process.

The image is an emission nebula as compared to a reflection nebula that reflects light from other stars. This type contains at least one bright star in its midst that provides the infrared light that makes it especially visible to the “WISE Explorer Observatory” that produced this image. For those interested in the specifics, the  infrared emissions from this nebula measured in microns in the 3.4 to 4.6 microns range indicates that the light is from within the nebula whereas infrared light in the 12 and 22 micron range is light reflected off of the dust within the nebula. Nebulae consist of dust and gas that are eventually used up in star formation if it is in a star forming  region. Otherwise the dust and gas are eventually dispersed by solar winds and radiation from stars that are relatively nearby.

Ring Of Black Holes

Ring OF Black Holes - NASA

Arp 147 is the name given to this pair of interacting galaxies located in the Milky Way Galaxy at a distance of about 430 million light years away. This image is a composite made by data from both the Hubble Space Telescope and the Chandra x-ray observatory. The pink is from the Chandra observatory while the red, green and blue is obtained from  the Hubble telescope and the Space Telescope Science Institute in Baltimore, MD. which depicts relativly young stars that are large and short lived in the remnant of the spiral galaxy on the right which is an expanding wave of star formation  in the blue ring that is occuring after the collision with the elliptical galaxy on the left which is mostly pink from the x-ray emission picked up by Chandra. After a few million years these large stars will explode into supernova, leaving behind neutron stars and black holes. The nine bright x-ray sources in the midst of the blue ring must be black holes because they emit such a large amount of x-ray emission. Other telescopes add additional data such as the NASA Spitzer Space Telescope as well as NASA’s Galex Explorer.