That symbol indicates a mass given in multiples of the mass of the Sun. NASA provides a nice listing…
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When will the Last Total Solar Eclipse Occur?
Richard Fienberg provided the answer to this question in a post to Sky & Telescope in 2006. As you…

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…

How Far Away From Earth Could We See the Sun with the Unaided Eye?
The Sun’s absolute magnitude, which is its brightness if it were located at a distance of 10 parsecs (about…

How Much Do Jupiter and Saturn Pull the Earth Away From the Sun?
To calculate the relative amount of gravitational pull that Jupiter and Saturn exert on the Earth relative to the…

How Much Power is Generated by the Aurora Borealis?
The solar-induced magnetic storms that produce the Northern (Southern) Lights, or Aurora Borealis (Australis), are generated when electrons from…