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University Daily Kansan / Thursday, February 13. 1992
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Study finds clues of black hole's existence
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NEW YORK — Researchers have found what they call the best evidence yet for the existence of a black hole. They found it by studying an unseen object orbited by a star in our Milky Way galaxy.
The Associated Press
The researchers calculated that the mass of the unseen object was large enough that it must be a black hole.
Other scientists said that the evidence was intriguing but that they did not yet consider it the strongest case for a black hole.
In theory, a black hole is an extremely dense object with a gravitational pull that is so strong that not even light can escape.
The latest work is reported in today's issue of the journal Nature.
"I think it's almost certainly a black hole," said study co-author Phil Charles, head of the astronomy group at the Royal Greenwich Observatory in the Canary Islands.
The researchers analyzed light from the orbiting star, which with the unseen object makes up a feature called V404 Cygni, at least 5,000 light-years away in the direction of the constellation Cygnus. A light-year is the distance light travels in one year, about 5.9 trillion miles.
The Associated Press
WASHINGTON—Richard Truly, a space shuttle pioneer who supervised NASA's return to flight after the Challenger disaster, resigned under White House pressure yesterday as head of the space agency.
NASA supervisor resigns under pressure
"Frankly, it wasn't what I had planned, but it's American history for you," Truly said. "It's a situation where the president decided ... to make a change. I've always said I served at the pleasure of the president."
Truly, a former astronaut, has been administrator of the agency since 1989
President Bush said in a written statement that Truly would remain on the job until April 1.
A National Aeronautics and Space Administration source said Truly was puzzled by the pressure to resign, which came from the new White House chief of staff, Samuel Skinner.
Sen. Almond Gore, D-Tenn., said the council may have forced Truly to leave by its insistence "on running NASA from the vice president's office even when the professionals at NASA advised strongly against the vice president's constant overruling of policy decisions at the agency."
By determining characteristics of the star's orbit, researchers calculated that the central object's mass must be at least six times that of the sun.
black holes, but Charles said that they had no physical justification for believing such objects existed
That is too massive for a compact object to be anything other than a black hole, according to standard theory.
Some theoretical work suggests that other hypothetical objects might have masses like those of
Yet, astrophysicist Joseph Dolan of the National Aeronautics and Space Administration's Goddard Space Flight Center in Greenbelt, Md., said that such weird, exotic species of a beast could not be ruled out.
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