<address id="9fb5l"></address>

        Space News from SpaceDaily.com
        Exoplanet hunter snares 'extreme' superhot world

        Paris, Sept 29 (AFP) Sep 29, 2020
        A European Space Agency satellite tasked with tracking down exoplanets has made its first big catch, a world so hot that its atmosphere could melt iron, astrophysicists have reported.

        Launched into Earth orbit in December, the CHEOPS space-based telescope spotted the gas giant circling close to one of the hottest known stars with a planetary system, according to a study published last week.

        "We estimate the temperature of WASP-189b to be 3,200 degrees Celsius (5,800 degrees Fahrenheit)," said lead author Monika Lendl, a scientist at the University of Geneva.

        "This object is one of the most extreme planets we know so far," she added, describing it as "very exotic".

        Some 322 light years away in the constellation Libra, WASP-189b is so close to its host star that it orbits in less than three days.

        It is too far away from Earth to see directly, but can be detected in other ways.

        When a planet passes between its star and an observer -- whether an astronomer on land or a telescope in space -- it dims the star's light by a tiny but measurable amount.

        This "transit" method has detected the vast majority of exoplanets discovered so far. NASA's Kepler spacecraft used it to find thousands of candidates from 2009 to 2013.


        - Burning blue hot -


        Exoplanets -- any planet outside our solar system -- were first confirmed to exist in 1995 by two Swiss astronomers, Michel Mayor and Didier Queloz, an exploit that earned them a physics Nobel last year.

        Queloz is among the more than 100 co-authors of the new study, published last week in the journal Astronomy & Astrophysics.

        There are 4,284 confirmed exoplanets as of September 29, according to the NASA Exoplanet Archive, and at least as many likely candidates.

        The vast majority are bigger than those of our solar system: 1,339 so-called ice giants, 1,457 Neptune-like gas giants, and 1320 "super Earths" with masses many times greater than the rock we call home.

        There are relative few -- 162 -- terrestrial planets with Earth-like mass, and of those only a handful are in a "temperate" zone that would support liquid water, a key ingredient for life as we know it.

        WASP-189b is unusual in that it does not reflect a lot of star light.

        "Instead, most of the starlight gets absorbed by the planet, heating it up and making it shine," said Lendl.

        WASP-189b's star is bigger than the Sun, and about 2,000 degrees Celsius hotter, the researchers reported.

        Because it is so hot, the star appears blue and not yellow-white like the Sun.

        Several studies estimate there could be a trillion exoplanets in our galaxy alone. Indeed, there may be as many or more exoplanets in the universe as there are stars.

        CHEOPS -- an acronym for CHaracterising ExOPlanet Satellite -- is in orbit 700 kilometres (435 miles) from Earth.




        Space News from SpaceDaily.com
        Turning Moon dust into oxygen
        Comet 2019 LD2 (ATLAS) found to be actively transitioning
        Cyprus rocky testing ground for Mars

        24/7 Energy News Coverage
        China's first domestically made nuclear reactor goes online
        UK Government funded 5G facility to be built in Oxfordshire
        China's 'shadow trade war' threatens Australia

        Military Space News, Nuclear Weapons, Missile Defense
        Iran assassination could undercut Biden's diplomatic options
        US sanctions Chinese, Russian firms over Iran dealings
        Iran accuses Israel of assassinating scientist and seeking 'chaos'

        24/7 News Coverage
        China to end all waste imports on Jan 1
        Neanderthals' thumbs were well-suited to 'squeeze,' study says
        German Entomological Institute names Danish mayfly Insect of the Year




        All rights reserved. copyright 2018 Agence France-Presse. Sections of the information displayed on this page (dispatches, photographs, logos) are protected by intellectual property rights owned by Agence France-Presse. As a consequence, you may not copy, reproduce, modify, transmit, publish, display or in any way commercially exploit any of the content of this section without the prior written consent of Agence France-Presse.


        一晚破了3个处