SKYWATCH: MAY’S TRANSIT OF MERCURY, DID FERMI SEE MERGING BLACK HOLES’ GAMMA RAYS?, AND MORE

LATEST NEWS

Did Fermi Detect LIGO’s Merging Black Holes

Sky & Telescope

NASA’s Fermi Gamma-ray Space Telescope might have detected a burst from the same merging black holes that emitted the gravitational waves LIGO detected. Or not.

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Dark Dwarf Galaxy Discovered

Sky & Telescope

Astronomers using the ALMA array of radio dishes have detected a dwarf galaxy 4 billion light-years away by the pull of its dark matter.

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OBSERVING HIGHLIGHTS

This Week’s Sky at a Glance, April 22 – 30

Sky & Telescope

The waning gibbous Moon joins Saturn and Mars in early morning skies, and Jupiter is high at nightfall.

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Is T CrB About to Blow its Top?

Sky & Telescope

The recurrent nova T Coronae Borealis last made a splash just after World War II. Does its current restive state hint at an imminent outburst?

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Get Ready for May 9th’s Transit of Mercury

Sky & Telescope

It doesn’t happen often, but soon you’ll be able to “spot the spot” – Mercury’s silhouette – as the innermost planet crosses the Sun’s disk. The next transit of Mercury won’t occur until 2019.

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Tour April’s Sky: Morning and Evening Planets

Sky & Telescope

In this month’s guided tour of the night sky, find Mars and Saturn near each other before dawn, while Jupiter and Mercury join the fading constellations of winter in the evening sky after sunset.

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COMMUNITY

Introducing Sky & Telescope‘s Celestial Globe

Sky & Telescope

Our state-of-the-art representation of the entire celestial sphere lets you explore the stars above as never before.

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Join S&T in Iceland, See the Northern Lights

Sky & Telescope

Join Sky & Telescope Observing Editor JR Johnson-Roehr for our fourth annual trip to Iceland to see the northern lights.

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