Ieu hiji planet hese dihartikeun nu keur 200 taun mucunghul nerangkeun Uranus'S orbit wobbly. Jeung aya adina panonpoé téori jadi deukeut urang sistim tatasurya nu astéroid disababkeun ka swerve arah Bumi.
Aya ngan hiji masalah: taya sahijieun tina “planét X” atawa “Nemesis” kungsi eksis, panalungtik ayeuna ngomong.
Atawa meureun teu.
“Sistim tatasurya luar meureun teu ngandung gas badag planet raksasa (“planét X”), atawa leutik, béntang pendamping (“Nemesis”),” menyimpulkan University of Pennsylvania astronom Kevin Luhman, anu diarahkeun ulikan ngagunakeun NASA sacara Wide-widang Infrabeureum Survey Explorer (wijaksana) teleskop.
Hasil dikaluarkeun dina édisi panganyarna The Astrophysical Journal.
Kalolobaan téori geus diperkirakeun Planét X jadi nepi ka opat kali ukuran Jupiter — planét pangbadagna di sistim tatasurya urang.
Maranéhanana ngusulkeun eta bakal kapanggih sababaraha 1,486 milyar kilométer (923 milyar mil) ti panonpoé, atawa ngeunaan 10,000 times farther than the Earth’s orbit.
But the images gathered by the telescope did not detect any object larger than Jupiter.
Luhman doesn’t rule out the possibility that a planet is lurking somewhere in the asteroid belt.
A computer generated NASA montage obtained 29 Agustus 2002 from images collected by the Voyager 2 spacecraft shows Neptune (Lower-L) as it would appear from a spacecraft approaching Triton, Neptune’s largest moon
It would be hard to find if it were closely aligned with a bright star that blinds the telescope or were much smaller than had been theorized.
But after this latest survey, Luhman said the odds of finding one are very unlikely: “That is like a one in a hundred chance.”
– History of Planet X –
Scientists first imagined the existence of Planet X in 1781, when they discovered Uranus, a gas giant that astonished astronomers with its orbital variations, apparently incompatible with Newton’s laws of gravity.
Observers concluded that these irregularities could be explained by the existence of another, unknown planet that was exerting its own gravitational force.
Attempts to track this mysterious Planet X led to the discovery of Neptune in 1846. But the estimated mass of Neptune couldn’t explain the deviations of Uranus’s orbit.
That led astronomers to continue their search for Planet X — nu mana, dina waktosna, led to the discovery of Pluto in 1930. But the dwarf planet was also too small to explain Uranus’s irregular path around the sun.
tungtungna, in the 1990s, researchers determined that they had slightly overestimated the mass of Neptune, which meant the planet could in fact be the reason for Uranus’s orbital behavior.
Yet Planet X believers were still not convinced.
– Sister sun killed dinosaurs? –
The existence of Nemesis, a sun-like star nearby, was first posited in the 1980s. The star, by occasionally coming closer to the sun, interfered with the orbit of comets and asteroids leading them to occasionally hit the Earth.
Collisions like these are blamed for the five mass extinctions over the last 540 juta taun — the most recent being the dinosaur extinction 65 juta taun ka tukang.
“So over the years, there have been different pieces of evidence suggesting there might be something there,” Luhman explained to AFP.
But the WISE telescope didn’t find anything.
The hunt for Planet X and Nemesis may have turned up empty, but the study did uncover 3,525 stars and brown dwarfs — celestial objects whose mass puts them between a star and a large planet — within 500 light years of the sun.
“Neighboring star systems that have been hiding in plain sight just jump out in the WISE data,” said Ned Wright, a University of California, Los Angeles astronomer who contributed to the study.