Stars – National Radio Astronomy Observatory

Is Sirius in Conjunction with the Sun on July 4 Each Year?

No. It is true that Sirius is above the horizon during a good part of the day during the…

The Sun’s absolute magnitude, which is its brightness if it were located at a distance of 10 parsecs (about…

A couple of things to note about radio signals that we measure from stars and other objects in the…

I believe that the most recent assessment of the age of this supernova remnant, based on an analysis of…

Let’s do the calculation using atomic mass units (u) for the Hydrogen and Helium atoms involved. H = 1.00784…

Yes. Planets that orbit a single star in a binary star system are called “non-circumbinary planets”. In general, a…

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