Astronomers captured this incredible image of a double-star system where a red giant star appears to have "engulfed the other (star) which, in turn, spiraled towards its partner provoking it into shedding its outer layers." The scientists spotted this astounding event using the Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope in the Chilean Andes. From the European Southern Observatory's (ESO) announcement:
Thanks to new observations with ALMA, complemented by data from the ESO-operated Atacama Pathfinder EXperiment (APEX), Olofsson and his team now know that what happened in the double-star system HD101584 was akin to a stellar fight. As the main star puffed up into a red giant, it grew large enough to swallow its lower-mass partner. In response, the smaller star spiralled in towards the giant’s core but didn’t collide with it. Rather, this manoeuvre triggered the larger star into an outburst, leaving its gas layers dramatically scattered and its core exposed.
The team says the complex structure of the gas in the HD101584 nebula is due to the smaller star’s spiralling towards the red giant, as well as to the jets of gas that formed in this process. As a deadly blow to the already defeated gas layers, these jets blasted through the previously ejected material, forming the rings of gas and the bright bluish and reddish blobs seen in the nebula.
A silver lining of a stellar fight is that it helps astronomers to better understand the final evolution of stars like the Sun.
Here's the scientific paper: HD 101584: circumstellar characteristics and evolutionary status (Astronomy Astrophysics) Read the rest
David Schneider built his own radio telescope out of roof flashing, an empty paint thinner can, a free software-defined radio app, USB receiver, and a length of coaxial cable. The whole project cost him less than $150 and he's already used it to detect galactic hydrogen and monitor the motion of our Milky Way galaxy's spiral arms. (With a radio telescope, you look for and measure radio-frequency radiation emitted by astronomical objects.) From IEEE Spectrum:
Point at Cygnus and you’ll receive a strong signal from the local arm of the Milky Way very near the expected 1420.4-MHz frequency. Point it toward Cassiopeia, at a higher galactic longitude, and you’ll see the hydrogen-line signal shift to 1420.5 MHz—a subtle Doppler shift indicating that the material giving off these radio waves is speeding toward us in a relative sense. With some hunting, you may be able to discern two or more distinct signals at different frequencies coming from different spiral arms of the Milky Way.
Don’t expect to hear E.T., but being able to map the Milky Way in this fashion feels strangely empowering. It’ll be $150 well spent.
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"For God's sake, fund it as a mainline program. Don't put it in yet another competition with science," Russell "Rusty" Schweickart insisted. "This is a public safety program." Read the rest
The European Southern Observatory (ESO) got this cool shot of Venus by using new adaptive optics that ignore earth's atmosphere while imaging celestial phenomena.
Via Universe Today:
In astronomy, adaptive optics refers to a technique where instruments are able to compensate for the blurring effect caused by Earth’s atmosphere, which is a serious issue when it comes to ground-based telescopes. Basically, as light passes through our atmosphere, it becomes distorted and causes distant objects to become blurred (which is why stars appear to twinkle when seen with the naked eye).
Head over to the article to see a remarkable before and after shot.
• This is a photo of Neptune, from the ground! ESO's new adaptive optics makes ground telescopes ignore the earth's atmosphere (Universe Today)
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Launched in 2011, Tiangong-1 was China's first space station. In the past seven years, it hasn't gotten a lot of use – only two crews of astronauts have spent time on it, in 2012 and 2013. Despite this, Tiangong-1 remained fully operational until, in 2016, China's space agency, the China National Space Administration, lost contact with it. As you read this, Tiangong-1 is falling towards earth. Each orbit it takes brings it closer to our atmosphere. Soon, gravity will finish the job it started, pulling Tiangong-1 back to earth.
No one's quite sure where the eight-ton piece of space junk is going to land yet, but thanks to the Virtual Telescope Project, it's possible to watch it as it comes down.
As Tiangong-1 makes its last few orbits of Earth before burning up in the atmosphere in a few days, you can watch the Chinese space station live online through a robotically controlled telescope at The Virtual Telescope Project.
Live coverage of the event will start Wednesday (March 28) at 8 a.m. EDT (1200 GMT), but the organizers said the timing could change closer to the event. You can visit this page on The Virtual Telescope Project's website to see updates.
Image: PxHere Read the rest
Recent revised estimates upping the number of galaxies in the universe seem even more mind-boggling when contemplating this image released from Hubble this week. It shows NGC 362, one of about 150 globular clusters on the outskirts of just one galaxy, our own Milky Way. Read the rest
TV astronomer and author Mark Thompson uses a pig eye he got from his local butcher to demonstrate what happens to people who make the mistake of looking at the sun through a telescope. Read the rest
A group of Fargo, North Dakota police officers confronted two men they thought were mounting a rifle on a tripod behind a garage at night. One man appeared to be wearing a tactical vest. Turned out that the "tactical vest" was a sweater and the two college students were just setting up a telescope behind their house to check out the moon.
NDSU student Levi Joraanstad told WDAY 6 that he and his buddy thought that it was just a couple of their neighbors trying to prank them by shining bright lights at them and yelling.
"I was kind of fumbling around with my stuff and my roommate and I were kind of talking, we were kind of wondering, what the heck's going on?," Joraanstadt said. "This is pretty dumb that these guys are doing this. And then they started shouting to quit moving or we could be shot. And so at that moment we kind of look at each other and we're thinking we better take this seriously."
Apparently the cops apologized when they realized that they had misread the situation. "Better safe than sorry," said one of the officers. Read the rest
This is one of the most-famous astronomy photos in the world. Called "The Pillars of Creation" it was taken by the Hubble telescope in 1995 and shows massive columns of hydrogen gas and dust in the Eagle Nebula—7,000 light years from Earth. Part of why these are a big deal is that columns of dust and gas like this are places where stars form.
But here's a cool and/or disappointing detail I hadn't known about until today. Back in 2007, researchers took more images of this region of space using the Spitzer Space Telescope. These shots suggest that the Pillars of Creation might actually be long gone—destroyed thousands of years ago by a nearby supernova.
A striking image from Spitzer shows the intact dust towers next to a giant cloud of hot dust thought to have been scorched by the blast of a star that exploded, or went supernova. Astronomers speculate that the supernova's shock wave could have already reached the dusty towers, causing them to topple about 6,000 years ago.
However, because light from this region takes 7,000 years to reach Earth, we won't be able to capture photos of the destruction for another millenium or so.
Space is crazy, y'all.
Read the rest at The Daily Galaxy Read the rest