The full moon on March 28, 2021, ranks as the 4th-closest (and therefore 4th-largest and 4th-brightest) of the 12 full moons of 2021. Is it a supermoon? Here's why experts disagree.

When the asteroid labeled 2001 FO32 sweeps closest to Earth on March 21, 2021, it'll be moving at such a fast pace that observers using telescopes might be able to detect its motion - its drift in front of the stars - in real time. Charts and info here.

A quasar is an extremely bright, distant object visible to radio telescopes. The source is an active galactic nucleus fueled by a supermassive black hole.

Can you still see Venus in the east before sunrise? It's easier from Earth's Southern Hemisphere than from the northern half of the globe. If you can see it, you just might catch the furtive rendezvous of Venus and Saturn at dawn on February 6, 2021.

Redshifts reveal how an object is moving in space, showing otherwise-invisible planets and the movements of galaxies, and the beginnings of our universe.

How to spot the radiant point for the Delta Aquariid meteor shower, going on now. Plus ... why meteors in annual showers have radiant points.

In the year 2021, the moon will swing to its farthest point from Earth on May 11, 2021, and then will come closest to Earth on December 4, 2021.

Lunar months are the time between successive new moons. A lunar month is also called a lunation or a synodic month.

The sun entered the constellation Sagittarius on December 18, 2020. It'll cross into the constellation Capricornus on January 19, 2021. Look here for dates of the sun's entry into the zodiacal constellations for 2021.

Jupiter and Saturn's great conjunction - where they appeared exceedingly close on the sky's dome - was December 21. Thank you to EarthSky community members from around the world who captured photos!