SUNSET: 
SpaceX Launches First Volley of Starlink Satellites
The 60 Starlink satellites parading across the sky make an incredible sight, but some skywatchers wonder at what cost to the night.
Could a Long-Ago Collision Explain Our Two-Faced Moon?
New research shows that a planetoid impact could have made our Moon asymmetric.
Happy Birthday, Lowell Observatory!
One of the nation's most famous observatories turns 125 years old. Let's all wish it a Happy Birthday!
Was ‘Oumuamua a Fragment from a Disintegrated Comet?
A new study suggests that ‘Oumuamua’s strange trajectory back out to interstellar space can be explained if the object had the density of air.
NASA’s Budget Gets a Boost for the Artemis Moon Initiative
As the White House requests an extra $1.6 billion for NASA’s Artemis project, the agency moves forward with commercial partnerships.
Jupiter's Great Red Spot Unfurls
Jupiter's South Equatorial Belt appears to be pulling material from the Great Red Spot in an event that's visible from small scopes.
Our Quiet Galaxy Used to Burst with Stars
New research shows that our quiet, middle-aged galaxy used to be quite the firecracker — a couple billion years ago it was exploding with new stars.
Watch International Space Station Flybys All Night Long
The annual International Space Station marathon viewing season begins later this week, when skywatchers in the Northern Hemisphere can watch up to five successive ISS passes in one night.
Solar System "Twin" Is Missing Its Baby Jupiters
Exceptional new images of the LkCa 15 system, a young, Sun-like star thought to host infant gas giant planets, shows those planets don't exist.
Apollo-era Data Reveal Moon’s Tectonic Activity
A new look at old seismic data gathered during the Apollo missions reveals young active faults as a possible origin of shallow moonquakes.
Astronomy Day is Coming Up! How You Can Participate
It’s that time of year again! It’s Astronomy Day! Join fellow enthusiasts on Saturday May 11th for a plethora of fun and exciting events in celebration of all things astronomical.
Planetary Society Grants Help Astronomers Track Dangerous Asteroids
There are some 25,000 near-Earth asteroids with diameters more than 140 meters. Amateur astronomers can find them — and the Planetary Society can help.
The Moon Bumbles Into the Beehive Friday
The thick crescent Moon occults oodles of stars in the Beehive star cluster Friday evening for much of the Americas.
A Link Between Fast Radio Bursts, Magnetars, and Supernovae?
What causes the bizarre, extragalactic fast radio bursts we’ve detected over the last decade? An unusually bright supernova may hold the answer.
Meet Spica, the Ear of Grain
Meet Spica, the "ear of grain" in the constellation Virgo. This bright star is actually part of a binary orbiting so closely, they tug each other out of spherical shapes and whirl around each other every four days.
Gravitational-wave Detectors Come Online, Find Possible Black Hole-Neutron Star Crash
Only a month into a new observing run, gravitational-wave observatories have announced five new signals — one of which could turn out to be a black hole swallowing a neutron star.
The Aurora Called STEVE Isn’t Aurora After All . . . Mostly
New observations of STEVE, the mauve celestial ribbon that aurora chasers have seen fluttering in the sky, have helped scientists determine the energy source of this unique phenomenon.
An Excellent Year for the Eta Aquariid Meteor Shower
With no Moon to muss, take a crack at seeing the Eta Aquariids, which could be one of the better meteor showers of the year.
May 2019: The Stars of Spring
Our Sky Tour podcast for May 2019 starts with meteors created by Halley's Comet and then helps you find the best stars and constellations in the evening skies of late spring.
Hubble Confirms Interstellar Buckyballs
From a jumble of confusing clues in Hubble observations of interstellar space, scientists have picked out evidence of a celebrity molecule: ionized Buckminsterfullerene, or buckyballs.
