Planetary 'autopsies' show that rocky worlds with geochemistry similar to Earth may be quite common in the cosmos.
WASHINGTON - A new way of studying planets in other solar systems - by doing sort of an autopsy on planetary wreckage devoured by a type of star called a white dwarf - is showing that rocky worlds with geochemistry similar to Earth may be quite common in the cosmos.
In a study published on Thursday, researchers studied six white dwarfs whose strong gravitational pull had sucked in shredded remnants of planets and other rocky bodies that had been in orbit. This material, they found, was very much like that present in rocky planets such as Earth and Mars in our solar system.
“The more we find commonalities between planets made in our solar system and those around other stars, the more the odds are enhanced that the Earth is not unusual,” said Edward Young, a geochemistry and cosmochemistry professor at the University of California, Los Angeles , who helped lead the study published in the journal Science. “The more Earth-like planets, the greater the odds for life as we understand it.
A white dwarf is the burned-out core of a sun-like star. In its death throes, the star blows off its outer layer and the rest collapses, forming an extremely dense and relatively small entity that represents one of the universe’s densest forms of matter, exceeded only by neutron stars and black holes.
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