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Why scientists are saying the new planet's surface is relatively cool is because its star is nearly as bright as our very own Sun, the team from the Massachusetts Institute of Technology in Boston said.

Researcher Diana Dragomir said the planet would not look anything like Earth. Because TESS stares non-stop at one slice of the sky for 27 days, then moves to a neighbouring slice, it captures an unprecedented view of these exploding stars as they brighten and then dim.

Like NASA's recently deceased Kepler space telescope, which is responsible for about 70 percent of all known exoplanet discoveries to date, TESS uses the "transit method".

Revealed in a press conference at a meeting of the American Astronomical Society (AAS), planet Kepler-10c is 17 times heavier than the Earth, and may require scientists to rethink their ideas on planet formation and the likelihood of life in our galaxy.

Experts compared the system to the famous "double-sunset" pictured on Luke Skywalker's home planet Tatooine in "Star Wars: A New Hope".

"We learned from Kepler that there are more planets than stars in our sky, and now TESS will open our eyes to the variety of planets around some of the closest stars", Paul Hertz, the director of NASA's astrophysics division, said in March 2018.

"We think this planet wouldn't be as gaseous as Neptune or Uranus, which are mostly hydrogen and really puffy", Dragomir says.

LHS 3884b is 49 light-years away in the Indus constellation, orbiting a cool M-dwarf star that's only about one-fifth the size of our sun.

"We've confirmed three planets so far, and there are so many more that are just waiting for telescope and people time to be confirmed", Dragomir said.

So the reprocessed, "cleaned-up" light curves were uploaded through the Exoplanet Explorers project on online platform Zooniverse, and the public was invited to "go forth and find us planets", Feinstein said.

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But she had only 24 followers and her first tweets went without being noticed until the BBC picked up the story. Immigration Minister David Coleman declined to comment.

During the first month of data collection, TESS captured images of six supernovae, said Michael Fausnaugh, another researcher at the MIT Kavli Institute. For what it's worth, several TESS finds have been the subject of pre-print research papers.

NASA's Kepler space telescope ran out of fuel in October a year ago.

These findings are from just the first few sectors TESS has observed in the Southern Hemispheres, beginning in July.

NASA expects TESS to allow for the cataloging of more than 1,500 exoplanets, but it has the potential to find thousands.

Tess monitors sections of the sky and waits for momentary dips in the light of about 200,000 nearby stars - a sign that a planet has passed in front of that star. Of these, officials anticipate, 300 will be Earth-size exoplanets or double-Earth-size Super Earths.

The habitable super-Earth appears to be a large, rocky planet with a surface temperature of about 72°F (22°C), similar to a spring day on Earth.

K2-288Bb lies within its star's habitable zone, meaning it is possible for it to hold liquid water.

The object shares many characteristics with our planet despite sitting 1,400 light years away. The findings from TESS are meant to provide a guide for more detailed observations by space telescopes yet to be built, including the European Space Agency's CHEOPS planet-hunting probe and NASA's James Webb Space Telescope. That telescope, launching in 2021, would be able to characterize the details and atmospheres of exoplanets in ways scientists have not been able to do.

Follow-up observations were made with multiple telescopes to confirm the exoplanet.


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