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Quasars in the Early Universe

Submitted by mjuliano on
Quasars are perhaps the best-known kinds of active galactic nuclei (AGN), galaxies whose central supermassive black holes are luminous, sometimes brighter than the rest of the galaxy. In ...

Coronal Holes During the Solar Maximum

Submitted by mjuliano on
Sunspots were first seen by Galileo, and in the eighteenth century Rudolf Wolf concluded from his study of previous observations that there was a roughly eleven-year solar cycle of activi...

The Uncertainties in Measuring Cosmic Expansion

Submitted by mjuliano-adm on
Ninety years after Edwin Hubble discovered the systematic motions of galaxies and George Lemaitre explained them as cosmic expansion from a point using Einstein’s equations of relativity,...

Active Nuclei in Luminous Galaxies

Submitted by mjuliano-adm on
The most luminous galaxies in the universe can be over a thousand times brighter than our Milky Way. They are not particularly bright in the optical, however, because most of their radiat...

A Rosetta Stone for Planet Formation

Submitted by mjuliano on
Planets are formed from the disk of gas and dust around a star, but the mechanisms for doing so are imperfectly understood.  Gas is the key driver in the dynamical evolution of plane...
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