But in 1992
a pair of astronomers turned up 1992 QB1, a body about 200 kilometers wide circling the sun at a distance of about 6.5 billion kilometers, well beyond Neptune's orbit.
But
a pair of astronomers are now putting the question of what defines a galaxy to a public vote, in the hope of reaching a consensus and avoiding the sort of controversy that surrounded Pluto being stripped of its status as a planet.
Not exact matches
In 1974, U.S.
astronomers Russell Hulse and Joseph Taylor discovered a
pair of radio - emitting neutron stars called pulsars orbiting each other.
Early this year
astronomers with the Sloan Digital Sky Survey released the largest color image
of the universe ever made, a trillion - pixel set
of paired portraits that covers one - third
of the night sky.
Decades passed before astronomical technology verified that idea: It wasn't until 1979 that
astronomers detected a real - life example
of a gravitational lens in the double image
of a quasar — side - by - side glimpses
of a galaxy's blazing heart, resembling a
pair of oncoming headlights.
Venus orbits the Sun, but not exactly on the same plane as the Earth, so it only passes directly between us and the Sun — what
astronomers call a transit; think
of it as a «mini-eclipse» — every century or so (and then, due to the odd dance
of gravity, it happens in
pairs separated by 8 years).
NASHVILLE, TENNESSEE —
Astronomers have peered deeper than ever into the chaos
of a
pair of colliding galaxies, revealing a nest
of stars exploding like fireworks.
Observations
of the trio demonstrate that swirling jets can help
astronomers find hidden black hole
pairs.
The cuddled - up
pair are closer to each other than any other known black hole duo, providing
astronomers a first peek at the final stages
of a possible collision.
Kepler 47: Strangest Sky Many stars in our galaxy exist in
pairs, and
astronomers had suspected that the competing pull
of two stars would make it difficult for planets to form.
Galaxies
of similar size to the Sombrero Galaxy may offer
astronomers their first glimpse
of a
pair of supermassive black holes merging.
A 21 - year study
of a
pair of ancient stars — one a pulsar and the other a white dwarf — helps
astronomers understand how gravity works across the cosmos.
In 1974,
astronomers Russell Hulse and Joseph Taylor detected a binary pulsar, a
pair of two dead stars emitting pulses
of radio waves.
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).
The
pairing of otherwise phenomenally rare galaxies suggests that they reside within a particularly dense region
of the universe at that period in its history, the
astronomers said.
The
pair, discovered by
astronomer William Herschel in 1784, form part
of the Virgo Cluster, a gravitationally bound collection
of nearly 2000 individual galaxies.
In a
pair of papers in the 1 November issue
of Astrophysical Journal Letters, radio
astronomer Nichi D'Amico
of the Bologna Astronomical Observatory in Italy and his colleagues report that the pulsar's faint radio blips disappear during nearly half
of its orbit, presumably eclipsed by a shroud
of gas from its companion.
Also in this Hubble image is another
pair of probably interacting galaxies — they are hiding to the right
of NGC 5256 in the far distance, and have not yet been explored by any
astronomer.
Astronomer George Djorgovski
of the California Institute
of Technology in Pasadena used adaptive optics on the 10 - meter Keck telescope, also on Mauna Kea, to reveal orbiting
pairs of black holes in 16 distant galaxies.
The case for dark matter began in the 1930s with a
pair of papers by two very different kinds
of geniuses, the buttoned - down Dutch
astronomer Jan Oort (who also hypothesized the Oort Cloud
of comets) and the explosive Swiss - American cosmologist Fritz Zwicky.
The pulsational
pair instability scenario requires a star more massive than anything ever seen in the universe, says
astronomer Shrinivas Kulkarni
of the California Institute
of Technology in Pasadena.
In January an international team
of astronomers confirmed that one
of the largest black holes in the universe is
paired with a much smaller partner nearby — the first definitive observation
of black holes in a close binary system [subscription required].
This would trigger gigantically powerful supernovas, known to
astronomers as «
pair - instability» supernovas, which would have added their own, slightly different mix
of elements to interstellar gas clouds, and to stars that formed from them.
This
pair of galaxies is named after the American
astronomer Halton Arp, the creator
of the Atlas
of Peculiar Galaxies, a catalogue
of weirdly - shaped galaxies that was originally published in 1966.
This is the first known example
of a gravitationally bound
pair of planetary mass objects, and
astronomers can't agree on a name for them.
By harnessing the extreme sensitivity
of the Atacama Large Millimeter / submillimeter Array (ALMA),
astronomers have directly observed a
pair of Milky Way - like galaxies seen when the universe was only eight percent
of its current age.
Taking advantage
of an unusual
pair of nearby stars,
astronomers have for the first time captured images
of a magnetic field generated by a star other than our sun.
In 1974, radio
astronomers Russell Hulse and Joseph Taylor, then
of the University
of Massachusetts Amherst, found just such a system: a
pair of dense neutron stars in orbit around each other.
In 1996, two teams
of astronomers announced the possible detection
of a planetary transit eclipse
of the close binary
pair CM Draconis Aab (Guinan et al, 1998; Martin and Deeg, 1996; and Guinan et al, 1996).
In 1996, two teams
of astronomers announced the possible detection
of a planetary transit eclipse
of the close binary
pair CM Draconis Aab, which has yet to be confirmed (further details below).
Just last month, the collision
of a
pair of neutron stars was observed in both light and gravity through a joint effort involving thousands
of astronomers on every continent in the world.
On March 11, 2013, an
astronomer revealed the discovery
of a
pair of brown dwarfs within seven light - years
of Sol.
Radio
astronomer Robert Wilson recalls a
pair of pigeons who almost thwarted the discovery
of cosmic background radiation.
Feb. 17, 2016 —
Astronomers have discovered an unnamed
pair of stars that sets a new record for both the longest duration stellar eclipse (3.5 years) and longest period between eclipses (69 years) in a binary system.
Astronomers have traced the orbit through our Milky Way Galaxy
of a voracious neutron star and a companion star it is cannibalizing, and conclude that the
pair joined more than 30 million years ago and probably were catapulted out
of a cluster
of stars far from the Galaxy's center.
A team
of astronomers using a
pair of National Science Foundation radio telescopes has made the first measurements
of the size and expansion
of a mysterious, intense fireball resulting from a cosmic gamma ray burst last May.
He is a member
of the survey team for the low - cost Kilodegree Extremely Little Telescope (KELT) system that consists
of a
pair of robotic telescopes designed to find exoplanets around bright stars operated by
astronomers at Ohio State University, Vanderbilt University, Lehigh University and the South African Astronomical Observatory.
Using the supersharp radio «vision»
of the National Science Foundation's Very Long Baseline Array (VLBA),
astronomers have made the first detection
of orbital motion in a
pair of supermassive black holes in a galaxy some 750 million light - years from Earth.
Its well known and attractive, visual binary
pair of a bright yellow star and a reddish - violet to pink companion was discovered in 1780 by Sir William Herschel (1738 - 1822), who was born Friedrich Wilhelm Herschel and subsequently discovered the planet Uranus in 1781 — which led to his appointment in 1782 as private
astronomer to the King
of England.
Astronomers have also found planets that orbit
pairs of stars rather than single stars, and other planets orbiting «failed» stars called brown dwarfs that aren't mighty enough to produce light and energy (or carry out fusion) like normal stars do.
Astronomers used Spitzer's infrared vision to study a dusty disk that swirls around a
pair of stars in the quadruple - star system HD 98800.
Using the supersharp radio «vision»
of the National Science Foundation's Very Long Baseline Array,
astronomers have made the first detection
of orbital motion in a
pair of supermassive black holes in a galaxy some 750 million light - years from Earth.
I learned this courtesy
of a
pair of online converters, one supplied by the U.S. Naval Observatory (because it's really
astronomers who groove on this Julian thing — apart from Google, that is), and the other out
of our own McMaster University.