Saturday, February 26, 2011

A Nebula by Any Other Name


A Nebula by Any Other Name
Nebulae are enormous clouds of dust and gas occupying the space between the stars. Some have pretty names to match their good looks, for example the Rose nebula, while others have much more utilitarian names. Such is the case with LBN 114.55+00.22, seen here in an image from NASA's Wide-field Infrared Survey Explorer, or WISE.

Named after the astronomer who published a catalogue of nebulae in 1965, LBN stands for "Lynds Bright nebula." The numbers 114.55+00.22 refer to nebula's coordinates in our Milky Way galaxy, serving as a sort of galactic home address.

Astronomers classify LBN 114.55+00.22 as an emission nebula. Unlike a reflection nebula, which reflects light from nearby stars, an emission nebula emits light. Emission nebulae are usually found in the disks of spiral galaxies, and are places where new stars are forming.

The colors used in this image represent specific wavelengths of infrared light. Blue and cyan represent light emitted at wavelengths of 3.4 and 4.6 microns, which is predominantly from stars. Green and red represent light from 12 and 22 microns, respectively, which is mostly emitted by dust.

Image Credit: NASA/JPL-Caltech/UCLA

Mars' Apollo 1 Hills


Mars' Apollo 1 Hills
An image taken from the Mars Exploration Rover Spirit's PanCam at the spacecraft's landing site shows the nearby hills named after the crew of Apollo 1--Gus Grissom, Edward White and Roger Chaffee. The crew perished in flash fire during a launch pad test of the spacecraft at Kennedy Space Center on Jan. 27, 1967. "Grissom Hill" is located 4.7 miles to the southwest of the rover Spirit's landing site. "White Hill" is 7 miles to the northwest and "Chaffee Hill" is 8.9 miles to the south-southwest.