On the evening of July 29, 2020, watch for the waxing gibbous Moon to pair up with Antares, the brightest star in the constellation Scorpius the Scorpion. Antares is a huge red supergiant star, with 15 to 18 times the mass of our Sun. Its exact size remains uncertain, but if placed at the center of the Solar System, it would reach to somewhere between the orbits of Mars and Jupiter. Antares lies about 600 light-years from our planet. Notice the ruddy color of Antares. It indicates a low surface temperature of about 3,500 kelvins (5,800 degrees F or 3,200 C). That’s in contrast to a surface temperature of about 6,000 kelvins (10,000 F or 5,500 C) for our yellow-colored Sun. Red supergiant stars are remarkably rare, accounting for one of every million or so stars in our Milky Way galaxy. Approximately 10 red supergiant stars are visible to the naked eye in a dark sky. On the evenings of July 28-29, 2020, let the moon show you Antares, the red supergiant star. Looking South to Southwest at the evening. Stay Tuned!
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