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Asteroid 2014 JO25 bigger than expected
It's coming closer today than any asteroid this large since 2004. It came into view of small telescopes a few hours ago. Early radar observations indicate it's bigger than we thought.
April 19, 2017
A star whose magnetic field flipped
Tau Boötis was the first star, other than our sun, ever seen to undergo a magnetic field reversal. This post also includes 2 great videos about our sun's magnetic reversals.
April 13, 2017
Watch for Venus before dawn
While watching Jupiter and the moon around April 9-11, don't forget Venus! It passed between us and the sun on March 25 and now blazes in the east before dawn.
April 10, 2017
Jupiter and its moons
The 4 largest moons of Jupiter - called the Galilean satellites - are Io, Europa, Ganymede and Callisto. Recent photos here.
April 9, 2017
No kidding! April Fools’ Comet
Comet 41P/Tuttle-Giacombini-Kresák will be closer to Earth on April 1 than it's been since its discovery. You need a telescope to see it, but there's an online viewing Friday night.
March 31, 2017
Colors of scintillating Venus
Venus reaches inferior conjunction today, officially leaving the evening sky. It has been low in the sky, where Earth's atmosphere has caused Venus to scintillate, or twinkle, in many colors.
March 25, 2017
Venus after sunset and before sunrise!
The planet Venus is now appearing in the west after sunset and in the east before sunrise. Don't believe it? Astronomer Bruce McClure reports on his observation.
March 23, 2017
March 4 moon hides Aldebaran
The occultation by the moon of Aldebaran - brightest star in Taurus the Bull - was visible from North America. Great set of photos here from the EarthSky community!
March 5, 2017
Catch Comet Encke this evening!
The comet's orbital period is short - only 3.3 years - and the orbit is relatively close to Earth. Encke's Comet is now on its 63rd known visit to our part of space.
February 27, 2017
