M33, UIT
M33 is a nearby example of a spiral galaxy. It is only slightly inclined to our line of sight such that we can see both structure in the spiral arms, and the central bulge. Observations of galaxies like these can help us determine the structure of our own Galaxy, the Milky Way.

M33 as it appears in ultra-violet light, observed with the Ultra-violet Imaging Telescope which flew on board the shuttle Columbia in December 1990. The light picks out young, hot, newly formed stars which trace out regions of active star formation in the arms of this spiral galaxy.

Image credit: UIT