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Read news from the world of astronomy for the week of April 2, 2021.
Latest News
June 10th’s annular eclipse of the Sun has a path that crosses southern Canada and the North Pole but will be a challenge to see.
Every year for April Fools’ Day, astronomers spend their copious spare time applying their craft to the true problems of the universe. Then they post the astonishing results to the arXiv’s preprint server.
Radar measurements taken early this month rule out any chance of a collision with Apophis over the next 100 years.
New analysis shows that Comet 2I/Borisov, which zipped nearest the Sun in late 2019, was unlike any comet we’ve seen before.
A “smoking gun” for the ancient calamity that formed Earth’s large Moon may still exist deep in the mantle of our planet.
Low-density exoplanets orbiting close to their host stars tend to lose their atmosphere. Now, astronomers can measure how fast it disappears.
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Observing Highlights
After twilight this time of year, Arcturus, the bright Spring Star climbing in the east, stands just as high as Sirius, the brighter Winter Star descending in the southwest. The last-quarter Moon is exactly at 6:02 a.m. Sunday morning EDT.

Jupiter is usually the one occulting and eclipsing the Galilean moons, but this observing season the moons also eclipse and occult one another.
To learn “what’s up” at night during April, download Sky Tour — an engaging narrated guide to the planets, stars, and constellations now visible.
Community
Oleg Bouevitch chats about his Sky & Telescope article on choosing a telescope for astrophotography.

Astronomer and engineer George Carruthers (1939–2020) designed and built the first observatory on another world.
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