Researchers Recover an Ancient Nova
https://www.amnh.org/explore/news-blogs/research-posts/researchers-recover-an-ancient-nova

On a cold March night in Seoul almost 600 years ago, Royal Imperial Astrologers spotted a bright new star in the tail of the constellation Scorpius.
It was seen for just 14 days before fading from view. From these ancient records, modern astronomers determined that what the ancient astronomers
saw in 1437 was a nova explosion, but they had been unable to find the binary star system that caused it—until now.

A new study published today by the journal Nature pinpoints the location of the old nova, which now undergoes smaller-scale “dwarf nova” eruptions.
The work supports that idea that novae go through a very long-term life cycle after erupting, fading to obscurity for thousands of years, then building
back up to become full-fledged novae once more.

“This is the first nova that’s ever been recovered with certainty based on the Chinese, Korean, and Japanese records of almost 2,500 years,”
said the study’s lead author Michael Shara, a curator in the Museum’s Department of Astrophysics.

http://www.nature.com/nature/journal/v548/n7669/full/nature23644.html

Uff...Silný kafe takhle navečír. Pokud nejde o ojedinělý jev, pak by se v Galaxii mohlo vyskytovat
až kolem 1B terestrických planet podobných Zemi. Sladké sny! Ať žije Drakeova rovnice :))

System: YZ Ceti
Discovered by: European Southern Observatory
Found on: August 14, 2017
Key Facts: Three Earth-mass worlds found around a small red star only 12 light-years away.

NASA's perspective: YZ Ceti is the nearest multi-planet system found orbiting a red dwarf star or "M dwarf."
While the three planets are outside their star's habitable zone, they are all about the same mass as Earth.
YZ Ceti b, c, and d are the lowest mass planets found with the planet-hunting method radial velocity. NASA's
TESS and James Webb telescopes will study more exoplanets around nearby stars in 2018, in hopes of finding
another Earth.

https://exoplanets.nasa.gov/news/1451/discovery-alert-three-earth-mass-neighbors/

https://arxiv.org/pdf/1708.03336.pdf

House-sized near Earth objects rarer than we thought
https://phys.org/news/2017-08-house-sized-earth-rarer-thought.html

A survey for NEOs being carried out with DECam on the 4-m Blanco telescope at the Cerro Tololo Inter-American Observatory has now estimated the number of objects
in near-Earth orbit that are similar in size to the Chelyabinsk impactor. Lori Allen, Director of the Kitt Peak National Observatory and the lead investigator on
the study, explained, "There are around 3.5 million NEOs larger than 10 meters, a population ten times smaller than inferred in previous studies. About 90% of
these NEOs are in the Chelyabinsk size range of 10-20 meters."

The study, to be published in the Astronomical Journal, is the first to derive, from a single observational data set with no external model assumptions, the size
distribution of NEOs from 1 kilometer down to 10 meters. A similar result was obtained in an independent study that analyzed multiple data sets (Tricarico 2017).

House-Sized Near Earth Objects Rarer Than We Thought
https://www.youtube.com/watch?v=XgQghDjaZwE

Distant galaxy sends out 15 high-energy radio bursts | Berkeley News
http://news.berkeley.edu/2017/08/30/distant-galaxy-sends-out-15-high-energy-radio-bursts/

reakthrough Listen, an initiative to find signs of intelligent life in the universe, has detected 15 brief but
powerful radio pulses emanating from a mysterious and repeating source – FRB 121102 – far across the universe.

Fast radio bursts are brief, bright pulses of radio emission from distant but largely unknown sources, and FRB
121102 is the only one known to repeat: more than 150 high-energy bursts have been observed coming from the object,
which was identified last year as a dwarf galaxy about 3 billion light years from Earth.

What Spacecraft Saw During the 2017 Solar Eclipse
https://www.youtube.com/watch?v=7RmczjiDlwE

VIRGO: NASA’s Johnson Space Center Closes Through Labor Day for Tropical Storm Harvey
https://www.nasa.gov/...sa-s-johnson-space-center-closes-through-labor-day-for-tropical-storm-harvey

Bad Astronomy | Astronomers discover a new type of star: BLAPs
http://www.syfy.com/syfywire/astronomers-discover-a-new-type-of-star-blaps

t’s not every day (or night, I suppose) that astronomers discover a new kind of star. In this case, it’s not so much that the stars are totally different from other stars,
and if you saw one you’d know right away something was amiss. Instead, these stars behave differently, in a way never seen before. And because of that, it took a special
kind of survey to even find them at all.

The stars are called Blue Large-Amplitude Pulsators, or BLAPs, an acronym that is both ridiculous and makes me very happy. They’re called this because a) they’re blue,
and 2) they pulsate, changing in brightness by the relatively large amount of 20 – 45%. That’s a lot. If the Sun did this we’d be alternately cooked and frozen.

Not only that, but these stars brighten and dim really quickly: They can go from one extreme to the other and back again in just over 20 minutes. Of the dozen or so found,
the shortest one pulses with a period of 23 minutes, and the longest 39. That’s incredibly fast. These are stars: Vast spinning balls of gas that tip the cosmic scales at
an octillion tons or ten. Changing something that size that rapidly and by that much is fearsome.