Detail View: NASA Chandra Space Telescope Collection:

Name: 
Optical/Radio comparison of M81, M82 and NGC 3077
Description: 
The galaxies M81, M82, and NGC 3077 in optical light (top) and radio waves from neutral hydrogen atoms (wavelength of 21 cm HI). The radio image shows tidal streamers of hydrogen gas connecting all three galaxies. These streamers were produced by a collision within the last 300 million years. (Credits: Optical: Digitized sky survey; Radio: NRAO/VLA/M.S.Yun)
facet_what: 
VLA
facet_where: 
M81
UID: 
SPD-CHAND-photo/2000/m82bh/m81hi_poss.jpg
original url: 
http://chandra.harvard.edu/photo/2000/m82bh/more.html