«We were looking
for orbiting pairs of supermassive black holes, with one offset from the center of a galaxy, as telltale evidence of a previous galaxy merger.
Not exact matches
No collisions have been observed directly, but astronomers have found several
pairs of black holes that are very close to each other, including some that are
orbiting each other and some that seem to be on course
for a collision.
A SCIENCE - FICTION scene could be playing out
for real about 4900 light years from Earth, where astronomers have spotted the first known
pair of planets jointly
orbiting a binary star system (Science, doi.org/h8h).
Tito's not -
for - profit mission, called Inspiration Mars, was initially supposed to use entirely private or commercial vehicles to launch a
pair of astronauts into Earth
orbit in early 2018.
One leading scenario
for forming tightly
orbiting black holes starts with a
pair of massive stars already
orbiting each other.
But the new evidence comes from a
pair of respected planetary scientists, Konstantin Batygin and Mike Brown of the California Institute of Technology (Caltech) in Pasadena, who prepared
for the inevitable skepticism with detailed analyses of the
orbits of other distant objects and months of computer simulations.
The problem is exacerbated by the lack of an adequate replacement
for a
pair of Earth - observation satellites, the
Orbiting Carbon Observatory and Glory, which failed on launch in the past two years.
PULSAR
PAIR A system of two radio beam — emitting pulsars locked in tight
orbits, illustrated here, is an ideal test bed
for measuring gravitational waves and other effects of general relativity.
KOI 1843.03 is not a confirmed planet yet — a
pair of stars that
orbit each other behind the target star can create the same signal,
for instance.
Physicists have known
for decades that every
pair of
orbiting bodies is a source of gravitational waves.
During the relatively brief, combined giant phases of the two stars at present, however, a planet could
orbit the Aab
pair far enough out
for the two stars to act as a single gravitational source and near enough
for it to receive enough energy to sustain life, possibly around 12.5 AUs out from the binary.
Fortunately, they do indeed often travel in
orbiting pairs, and do sometimes,
for a very brief period before they merge,
orbit rapidly enough to produce gravitational waves that LIGO and VIRGO can observe.
The forty - nine experts who discovered this planet admit that they have no theoretical understanding
for how such a planetary system could have evolved.10 One planetary system (having at least two planets)
orbits a
pair of suns!
Normally, NASA watches
for this wild space weather using solar observatories like SOHO and the STEREO mission, a
pair of solar -
orbiting satellites pointed at the Sun from two different angles.
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