The gibbous moon moves through the southern sky in the evenings ahead. On Monday night the moon appears right under the bright red star Antares in the zodiacal constellation Scorpius. Antares is one of the largest and distant stars visible in our evening sky. The star is 600 light years away, twice the distance astronomy books estimated 20 years ago. The star is 10,000 times more luminous than our own Earth. For purposes of comparison, if Antares were our sun, the star’s size exceeds that of Mars’s orbit. Antares is truly a big star. Among astronomers it is called a super giant.