Salt glaciers on Mercury suggest conditions friendly to life — but not life itself — might once have existed on the innermost planet.
This Tuesday the 28th we will see the Moon rise in twilight as far north as it possibly can. Do you know why?
A brilliant flash of blue light briefly outshined its host galaxy before fading away — but then it exploded again and again, shedding light on the nature of its source.
Before the advent of computers or even a working theory of the solar system, the ancients predicted solar eclipses. How did they do it?
Observers across much of the U.S. and Canada have a unique opportunity Monday night, November 20–21, to see Uranus's brightest moon occult a star.
The distribution of elements seen in the samples of Ryugu brought back by Hayabusa 2 hints at a wet past.
A mere 200 light-years away, there's a planet with the density of styrofoam and clouds of sand. How did it get so weird?
Jupiter's Great Red Spot may be reaching a milestone this year by shrinking to its smallest size in recorded observational history.
Astronomers are gearing up for an unusual celestial event: an asteroid’s occultation of an iconic star.
The Hubble and Webb Space Telescopes have revealed a bounty of galaxies in a pair of colliding clusters, capturing twinkling lights within.
The Lucy mission's flyby of the main-belt asteroid Dinkinesh resulted in a surprise — yet another asteroid moon!
The Horsehead Nebula and other stunning scenes highlight the talents of the just-launched Euclid mission. The telescope will reach into the depths of the cosmos to understand dark matter and dark energy.
The Great Square, now upright, guides your way down to Fomalhaut and Diphda and, farther down, Alpha Phoenicis – a chance to add a new constellation to your life list. And plan to catch the Moon-Venus pairing in early dawn on the 9th.