Our Tiny Moon Hides A Supergiant Star Tonight

How does the moon do it? Only 2,160 miles across, tonight it will cover a supergiant star 75 times the diameter of the sun,  23 times more massive and 165,000 times more luminous. Amazing. The moon does its trick because it’s so close to the Earth, the same way you can raise your thumb and hide…
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Earth Crosses Comet Johnson Orbit, Tails Twist

Comet C/2015 V2 Johnson has been sliding south down the side of Boötes the Herdsman all month and slowly brightening. The “2015” in its name was the year of its discovery. On Nov. 3, 2015, astronomer J.A. Johnson, working with the Catalina Sky Survey, found the then-faint new comet in the constellation Lynx the Lynx not…
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Big Auroras Light Up Memorial Day Weekend

Wow! What a night. I didn’t get to bed until 1:30 this morning. No regrets though. The display of oozing, expanding, pulsing and darting northern lights was second to none. What made this round of aurora so interesting for me was the nearly complete absence of sharp edges. Everything I saw — even the occasional…
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Geomagnetic Storm Tonight May 27-28 — Watch For Aurora

The space weather crew just sent out a revised forecast for a moderate aurora storm (G2) tonight. It’s already underway with Kp=6 as of 8 p.m. (CDT). I encourage you to watch the northern sky as soon as it gets dark. A coronal mass ejection from May 23 has hooked into Earth’s magnetic envelope stoking…
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Crescent Supermoon Smiles In The West Tonight

You normally hear the term supermoon applied to an unusually close (and large) full moon, but the truth is, a supermoon can occur during other phases, too. The closest supermoons happen during full and new moon, the two times a month when the sun, Earth and moon are lined up in a row. This month’s supermoon occurred on…
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