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johnhan279

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Water found in habitable super-Earth's atmosphere for first time

Orbiting around a relatively docile red dwarf star, the exoplanet is "the best candidate for habitability that we know right now."
By Jake Parks | Published: Wednesday, September 11, 2019

Astronomers have finally uncovered water vapor in the atmosphere of a super-Earth exoplanet orbiting within the habitable zone of its star. The find means that liquid water could also exist on the rocky world's surface, potentially even forming a global ocean.
The discovery, made with NASA's Hubble Space Telescope, serves as the first detection of water vapor in the atmosphere of such a planet. And because the planet, dubbed K2-18 b, likely sports a temperature similar to Earth, the newfound water vapor makes the world one of the most promising candidates for follow-up studies with next-generation space telescopes.
"This is the only planet right now that we know outside the solar system that has the correct temperature to support water, it has an atmosphere, and it has water in it, making this planet the best candidate for habitability that we know right now," lead author Angelos Tsiaras, an astronomer at University College London, said in a press conference.
 

johnhan279

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Bizarre comet from another star system just spotted
Discovered by an amateur astronomer, the inbound object is only the second of its kind yet detected.
By Michael Greshko

PUBLISHED September 12, 2019
National Geographic.

In the sleepy predawn hours of August 30, a Ukrainian amateur astronomer named Gennady Borisov spotted a strange comet zooming through our solar system. Now, astronomers have provisionally verified that the object, named C/2019 Q4 (Borisov), is moving too fast for it to be captured by the sun’s gravity—a sign that it’s most likely an interstellar interloper.

If these results continue to hold, C/2019 Q4 would be just the second visitor from another star system ever detected, after the 2017 discovery of the enigmatic space rock known as 'Oumuamua. While its origins are not yet entirely certain, C/2019 Q4 is a confirmed comet. Already, astronomers have detected that the object—which is probably a couple miles across—has a coma, the fuzzy sheath of dust and gas that forms as sunlight heats up a comet’s icy surface.
 

gerhard dengler

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Bizarre comet from another star system just spotted
Discovered by an amateur astronomer, the inbound object is only the second of its kind yet detected.
By Michael Greshko

PUBLISHED September 12, 2019
National Geographic.
This object must be travelling at a huge speed if it can repel the force of the Sun's gravity.
 

Rommel

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We are just a small insignificant little corner of the milky way in the grand scheme of things.
 

gerhard dengler

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We are just a small insignificant little corner of the milky way in the grand scheme of things.
In terms of the overall size of the Universe, we occupy not even a fragment.

What velocity would that object need to travel at, to remain immune to Sun's gravity?
 
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