ALMOST-SPOTLESS SOLAR FLARE: Earlier today (0004 UT on Aug. 9th), the spotless sun produced a C1-class solar flare: movie. Upon closer inspection, the sun might not be spotless after all. A new sunspot is emerging from the blast site. Solar flare alerts: SMS Text.
RARE NAKED-EYE NOVA: Every 20 years or so, a thermonuclear explosion occurs on the surface of RS Oph, a white dwarf in the constellation Ophiuchus. Yesterday it happened again. On Aug. 8th, the brightness of the tiny star increased 600-fold, from magnitude +12 to +5. Keith Geary of Ireland was the first to notice. Hours later, Italian astronomer Ernesto Guido and colleagues photographed the outburst using a remote-controlled telescope in Australia:
This is called a "recurrent nova," and it is rare. In the whole Milky Way galaxy, only 7 star systems are known to produce such explosions.
RS Oph is actually a binary star--a very lopsided one. On one side is a white dwarf, on the other is a red giant. There's very little distance between the two, so the gravity of the white dwarf is able to pull gaseous material off the larger star down onto itself. Every couple of decades, enough matter accumulates to trigger an explosion. The last time this happened was back in 2006.
At 5th magnitude, the current outburst is visible to the unaided eye, albeit just barely. Binoculars or a telescope will allow you to see it with ease. Look south after sunset. Ophiuchus hangs high in the sky just above the better known constellations Scorpius and Sagittarius. Sky maps: simple, detailed, really detailed.
Update: Variable star observer Filipp Romanov of Yuzhno-Morskoy, Russia, has just seen RS Oph and estimates that its magnitude has increased further to +4.6.
Realtime Space Weather Photo Gallery
Free: Spaceweather.com Newsletter
LIMITED EDITION MIRROR KIRK: In 1967, a transporter accident sent James T. Kirk into a parallel universe, swapping the captain of the Enterprise with his evil twin. We just found him ... in the stratosphere. Here is "Mirror Kirk" floating 95,254 feet high onboard an Earth to Sky Calculus cosmic ray research balloon:
You can have him for $170.10 (the serial number of the Enterprise divided by 10). Inspired by the classic "Mirror, Mirror" episode of Star Trek first broadcast on Oct. 6, 1967, this 8" statue is made of high-quality polystone resin and expertly painted. It comes with a greeting card showing Kirk in flight and a certificate of authenticity.
To celebrate the 50th anniversary of Star Trek, only 1000 limited edition Mirror Kirk statues were manufactured and sold at sci-fi conventions in 2016. We've collected a few of these rarities to fly to the stratosphere. Get yours now.
Far Out Gifts: Earth to Sky Store
All sales support hands-on STEM education
Realtime Noctilucent Cloud Photo Gallery
Free: Spaceweather.com Newsletter
Realtime Aurora Photo Gallery
Free: Spaceweather.com Newsletter