SUNSET: 
Galaxy Cluster Spotted in Early Universe
Astronomers discover a vast collection of young galaxies from the early universe.
How Dead Galaxies Stay Dead
A galaxy in the midst of a merger isn’t forming stars, even though it could. Astronomers think the galaxy’s central black hole might be the reason why.
Disk Around HR 8799 Hints at Hidden Fifth Planet
A high-resolution ALMA image of the HR 8799 planetary disk suggests undiscovered planet.
Amateur Astro-imagers Get Ready for Juno
Planetary scientists are counting on amateur observations to enhance the results from NASA's forthcoming Juno mission.
Dwarf Planet 2007 OR10: Big, Dark, and Slow
A Kuiper Belt object discovered nearly a decade ago turns out to be much darker — and thus larger — than thought. It's also an especially slow spinner.
Watch the International Space Station Marathon
The orbiting science laboratory begins a series of marathon passes this week that favor the northern hemisphere.
Curiosity Sees Seasonal Trends on Mars
During two Martian years, Curiosity tracks seasonal patterns in atmosphere, temperature, and maybe even methane.
Follow Mars to His Double Star Lair
Let Mars be your guide to no fewer than 15 diverse and delightful double stars that pepper its path through Scorpius and Libra this opposition season.
Mars Opposition: Best Showing in a Decade
At last, a fine Mars apparition: on May 22nd the Red Planet reaches opposition, shining almost as bright as Jupiter, and the planet makes its closest approach to Earth on May 30th.
The Resurgence of the Brightest Supernova
In 2015 ASASSN-15lh gained fame as the most luminous supernova ever discovered. Almost a year later and against all odds, the supernova has rebrightened.
ExoMars Rover Launch Delayed Until 2020
The European Space Agency is opting to send its first rover to the Red Planet two years later than originally planned.
Spring Astronomy Day 2016
Join your local amateur astronomy community in celebrating Spring Astronomy Day on May 14, 2016.
Mercury's Slow Glide Across the Sun
May 9th's transit of Mercury is now history. Countless amateurs — and professionals — watched as the innermost planet had its day in the Sun. It's sometimes the curse of being involved in astronomical outreach that I miss all the action during an important celestial event. For example, I never…
Kepler’s 1,284 Newly Confirmed Planets
Even though Kepler’s primary mission ended three years ago, the data it collected just revealed a mother lode: 1,284 newly confirmed planets.
S&T Live Webcast: Transit of Mercury
Join in Monday, May 9th, as tiny Mercury crosses the Sun's disk for the first time since 2006. S&T's exclusive video feeds and expert interviews will air throughout the 7½-hour event.
Mercury Transit: Everything You Need to Know
The littlest planet will cross the enormous Sun for viewers in most of the world.
Where Big Bird Neutrino May Come From
Scientists might have found the source of an incredibly energetic particle that bored into the Antarctic ice sheet.
Eta Aquariid Meteor Shower Reaches Its Peak
If you'd like to see bits of debris shed by Halley's Comet, then head out before dawn during the next few days.
Light Echoes Map Planet-forming Disk
Light’s finite speed helped astronomers pinpoint the location of the “inner wall” of the disk of dust and gas that’s feeding a fast-growing baby star.
Earth-size Planets Around Nearby Dwarf Star
Astronomers just discovered three planets, two of which are roughly the size of Earth, orbiting a dim nearby dwarf star. Their proximity makes their atmospheres ripe for observing.
