VIRGO: Pátý průlet úspěšně absolvován (pátek 8h SELČ).
Všechny přístroje i JunoCam nabíraly data. První snímky ke stažení:
JunoCam : Processing | Mission Juno
https://www.missionjuno.swri.edu/junocam/processing

PRJ 19/05 - proc. J. Majora

VIRGO: Čerstvé info z první ruky (Jasona Wrighta)!

Tabby's Star is dimming right now (archived video of chat with Jason Wright)
https://www.youtube.com/watch?v=eYpIGZS8nJc


Astronomers scramble as ‘alien megastructure’ star dims again | New Scientist
https://www.newscientist.com/...2131871-astronomers-scramble-as-alien-megastructure-star-dims-again/

The most famously weird star in our galaxy is acting up again. On Friday, 19 May, Tabby’s star began to dim,
carrying on a history of mysterious dips in brightness. Astronomers are scrambling to point as many telescopes
as possible at the star, which is 1,300 light-years away in the constellation Cygnus, to decipher its strange signal.

In 2015, a team of astronomers led by Yale’s Tabetha Boyajian saw the light from the star KIC 8462852 suddenly and
repeatedly dip in brightness. The star dimmed by up to 22 per cent before it returned to normal.

Then, in 2016, a review of old photographic plates revealed that KIC 8462852 dimmed by 14 per cent between 1890 and 1989.
The star, nicknamed Tabby’s star after Boyajian, faded by another 3 per cent over the four years it was observed by t
he Kepler space observatory.

Astronomers have come up with a huge variety of different potential explanations for the star’s strange behaviour.
Some say it could be because of its interior dynamics, some say it could be surrounded by a swarm of asteroids and debris.
Or maybe it’s dimming because it devoured a planet at some time in the past. Most famously, some astronomers have said that
the dimming could be caused by an orbiting alien megastructure.

Because Tabby’s star has cultivated such an air of mystery, the response to its new dimming has been quick and enthusiastic,
with some telescope observations of the star already planned over the next few days. If we’re lucky, new observations may
just help us figure out what’s making KIC 8462852 dim (it’s probably not aliens).

!!!!!!!!!!!

Tabetha Boyajian‏: TabbysStar IS DIPPING! OBSERVE!!

Tabetha Boyajian on Twitter: "#TabbysStar IS DIPPING! OBSERVE!! @NASAKepler @LCO_Global @keckobservatory @AAVSO @nexssinfo @NASA @NASAHubble @Astro_Wright @BerkeleySETI"
https://twitter.com/tsboyajian/status/865530700128075780

2017-06-OTS44-disk | Max Planck Institute for Astronomy
http://www.mpia.de/news/science/2017-06-ots44-disk

First radio observations of the lonely, planet-like object OTS44 reveal a dusty protoplanetary disk that is very similar
to disks around young stars. This is unexpected, given that models of star and planet formation predict that formation
from a collapsing cloud, forming a central object with surrounding disk, should not be possible for such low-mass objects.
Apparently, stars and planet-like objects are more similar than previously thought. The finding, by an international team
led by Amelia Bayo and including several astronomers from the Max Planck Institute for Astronomy, has been published
in Astrophysical Journal Letters.

Astronomers make the largest map of the Universe yet | SDSS | Press Releases
http://www.sdss.org/press-releases/astronomers-make-the-largest-map-of-the-universe-yet/

Astronomers with the Sloan Digital Sky Survey (SDSS) have created the first map of the large-scale structure of the Universe based
entirely on the positions of quasars. Quasars are the incredibly bright and distant points of light powered by supermassive black holes.

Snowball Earth melting led to freshwater ocean 2 kilometres deep | New Scientist
https://www.newscientist.com/...25-snowball-earth-melting-led-to-freshwater-ocean-2-kilometres-deep/

A little more than 600 million years ago, you could have drunk from the ocean.

After an extreme ice age known as snowball Earth, in which glaciers extended to the tropics and ice up to a kilometre thick covered the oceans,
the melt formed a thick freshwater layer that floated on the super-salty oceans.

Those freshwater surface seas lasted far longer than thought, according to research by Dorian Abbot, a geologist at the University of Chicago,
and his colleagues. Their mathematical models showed that it took around 50,000 years for the two layers to fully merge.

“This is interesting because the modern ocean mixes on a timescale of only about 1000 years,” says Abbot.

The much slower mixing was due to the huge density and temperature differences between the layers. During the snowball phase, half the oceans’
water ended up as snow and ice. The remaining seas were twice as salty as today, and near their freezing point.

Once the ice melted, driven by a runaway greenhouse effect caused by volcanic eruptions, it formed a freshwater layer up to 2 kilometres thick.