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In a bid to determine whether distant stars with planets orbiting them
can harbour life, a global team of astronomers has discovered a new way
to measure the pull of gravity at the surface of distant stars.
Knowing the surface gravity of a star is essentially knowing how much you would weigh on that star. If stars had solid surfaces on which you could stand, then your weight would change from star to star.
The new method allows scientists to measure surface gravity with an accuracy of about four per cent, for stars too distant and too faint to apply current techniques. Since surface gravity depends on the star's mass and radius (just as your weight on Earth depends on its mass and radius), this technique will enable astronomers to better gauge the masses and sizes of distant star. "If you don't know the star, you don't know the planet. The size of an exoplanet is measured relative to the size of its parent star," said study co-author and professor Jaymie Matthews from University of British Columbia. If you find a planet around a star that you think is Sunlike but is actually a giant, you may have fooled yourself into thinking you've found a habitable Earth-sized world. "Our technique can tell you how big and bright is the star, and if a planet around it is the right size and temperature to have water oceans, and maybe life," Matthews added.
Knowing the surface gravity of a star is essentially knowing how much you would weigh on that star. If stars had solid surfaces on which you could stand, then your weight would change from star to star.
The new method allows scientists to measure surface gravity with an accuracy of about four per cent, for stars too distant and too faint to apply current techniques. Since surface gravity depends on the star's mass and radius (just as your weight on Earth depends on its mass and radius), this technique will enable astronomers to better gauge the masses and sizes of distant star. "If you don't know the star, you don't know the planet. The size of an exoplanet is measured relative to the size of its parent star," said study co-author and professor Jaymie Matthews from University of British Columbia. If you find a planet around a star that you think is Sunlike but is actually a giant, you may have fooled yourself into thinking you've found a habitable Earth-sized world. "Our technique can tell you how big and bright is the star, and if a planet around it is the right size and temperature to have water oceans, and maybe life," Matthews added.
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