SUNSET: 
ASTRONOMY & OBSERVING NEWS
60-second Astro News: Solving Supernova Mysteries
This week, astronomers have solved one supernova mystery and predicted a new one — to be solved in 2037.
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observing guides
Where to Look Tonight
This Week's Sky at a Glance, September 17 – 25
This Week's Sky at a Glance, September 17 – 25
The waxing gibbous Moon shines with Jupiter and Saturn on its way to full. And as summer turns to fall, Deneb replaces Vega as the zenith star after dusk.
where to lookSummer Triangle Overhead
Sky Tour Podcast
The calendar might say “September,” but now is the perfect time to explore the Summer Triangle. Find your way with this month’s Sky Tour podcast.
Subscribe NowWhat are the Phases of the Moon?
What are the Phases of the Moon?
The phases of the Moon are determined by the relative positions of the Moon, Earth, and Sun.
Read moreEditor's PICKS
Photographer: Steve Leonard
"Ptolemaeus, Alphonsus and Catena Davy"
Photographer: Fabrizio Antonucci
Photographer: Giancarlo Melis
Photographer: soumyadeepmukherjee
Large Solar Prominence - Sept 11, 2021
Photographer: Behyar Bakhshandeh
Photographer: Jeff
Photographer: KuriousGeorge
Photographer: Robert-Fields
Photographer: Ralph-Ford
Photographer: Joel
Photographer: KuriousGeorge
Pickering's Triangle in Veil Nebula
Photographer: Kevin-Boucher
Perseid Streaking past the Summer Milky Way
Photographer: astrorx
The Vela Supernova Remnant in Narrowband Light
Photographer: Hal Heaton
Photographer: KuriousGeorge
Photographer: Robert-Fields
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Sky & Telescope Magazine
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Issue Highlights
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A Golden Age for Amateur Astronomy
William Sheehan and Klaus Brasch
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Building the James Webb Space Telescope
Paul H. Geithner
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To Build or Buy?
Jerry Oltion