July 2021 guide to visible planets | | Watch for the Venus-Mars conjunction around mid-month, in the western twilight sky. Watch Jupiter and Saturn. They're gearing up for their oppositions - their best time to be viewed in Earth's sky - in August. And, in the early part of July, watch for elusive Mercury before sunrise. Here's how to see July's visible planets. | | |
Planet makes a surprise photobomb | | Astronomers said this week they were observing 2 planets orbiting a star some 50 light-years away, when a 3rd planet made a surprise photobomb of their image. The star is Nu2 Lupi. It's visible with the unaided eye from Earth's Southern Hemisphere. Astronomers discovered the 3 planets around the star in 2019, whose "years" or orbital periods lasted 12, 28 and 107 days. Astronomers knew the 2 planets closest to the star would be visible as they transited - or crossed in front of - the star's bright surface. But the appearance of the outermost known planet was a welcome surprise. Because Nu2 Lupi is such a bright star - so relatively close to us - these scientists called the photobombing planet "... a golden target for future study with no known equivalent." Read more. | | |
Thuban is a former pole star | | Thuban is not a particularly bright star, but it holds a special place in the hearts of stargazers. That's because Thuban - a relatively inconspicuous star in the constellation Draco the Dragon - was the pole star some 5,000 years ago, when the Egyptians were building the pyramids. Read more. | | |
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