Galaxies frequently collide with one another, leaving evidence for their stupendous interactions nearly everywhere in the sky. Our own Milky Way galaxy, for example, is heading towards it...

The complex sequence of events that lead to star formation, processes once thought to involve just the simple coalescence of material under the influence of gravity, continues to amaze an...

Cambridge, MA What do military detections of jet aircraft, space-based Earth observations, and studies of distant, extrasolar planets have in common? All make use of HITRAN, which stands...

The Earth is not the only planet whose atmosphere experiences seasonal weather changes. Optical observations of planets in our outer solar solar system, (Jupiter and Saturn, for example) ...

Most stars form in clusters, sometimes with ten thousand or more stars packed into a volume smaller than a few light-years in radius. (By way of comparison, the nearest star to the sun is...

Over the past two decades astronomers have come to realize that many galaxies are fabulously luminous -- some are more than a thousand times brighter than our Milky Way. Yet the most powe...

Here on earth we are aware of ultraviolet (UV) radiation in space because of the dangers it poses to our health; the atmosphere is our shield against its damaging effects. Most astronomi...

Many of our most profound mysteries -- for example, the nature of black holes, the birth of planets, and even the origin of life -- have stories that are intricately interwoven with the s...

There are currently 228 known planets around stars other than our sun, and all of them were discovered in one of only three kinds of observations: the periodic wobble of the "color" of th...

Cambridge, MA The leading method of finding planets orbiting distant stars spots mostly Jupiter-sized worlds. Technology limitations make it difficult to detect smaller planets. But that...