*** The Official Astronomy & Universe Thread ***

Stellar flares from a mini star:


On April 23, NASA's Swift satellite detected the strongest, hottest, and longest-lasting sequence of stellar flares ever seen from a nearby red dwarf star. The initial blast from this record-setting series of explosions was as much as 10,000 times more powerful than the largest solar flare ever recorded.

At its peak, the flare reached temperatures of 360 million degrees Fahrenheit (200 million Celsius), more than 12 times hotter than the center of the sun.

The "superflare" came from one of the stars in a close binary system known as DG Canum Venaticorum, or DG CVn for short, located about 60 light-years away. Both stars are dim red dwarfs with masses and sizes about one-third of our sun's. They orbit each other at about three times Earth's average distance from the sun, which is too close for Swift to determine which star erupted.

At 5:07 p.m. EDT on April 23, the rising tide of X-rays from DG CVn's superflare triggered Swift's Burst Alert Telescope (BAT). Swift turned to observe the source in greater detail with other instruments and, at the same time, notified astronomers around the globe that a powerful outburst was in progress.

For about three minutes after the BAT trigger, the superflare's X-ray brightness was greater than the combined luminosity of both stars at all wavelengths under normal conditions.

The largest solar explosions are classified as extraordinary, or X class, solar flares based on their X-ray emission. The biggest flare ever seen from the sun occurred in November 2003 and is rated as X 45. But if the flare on DG CVn were viewed from a planet the same distance as Earth is from the sun and measured the same way, it would have been ranked 10,000 times greater, at about X 100,000.

How can a star just a third the size of the sun produce such a giant eruption? The key factor is its rapid spin, a crucial ingredient for amplifying magnetic fields. The flaring star in DG CVn rotates in under a day, about 30 or more times faster than our sun. The sun also rotated much faster in its youth and may well have produced superflares of its own, but, fortunately for us, it no longer appears capable of doing so.
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Talking about telescopes how cool is this. open space is creating a 3d printed/laser cut relescope that will vastly reduce the cost and currently uses a Lumina 1020 phone to take pictures and arduino to control the motors. Will be keeping an eye on this.
The first one they are beta testing at, is 3.5", but reading else where looks like an 8" and 20" will follow

https://openspaceagency.squarespace.com/
This dream would have been almost impossible just 24 months ago. The levels of precision required for a maker-made scientific quality scope would have resulted in compounding errors conspiring to make observations frustrating for aspiring citizen scientists. However the emergence of low-cost 3D printers and Laser-cutting, paired with microcontroller platforms such as Arduino and Lumia 1020- with its 41 Megapixel CCD - mean that a project such as this is now eminently possible.
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