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Astronomers have made great efforts to find and analyse brown dwarfs in the Pleiades and other young clusters, because they are still relatively bright and observable, while brown dwarfs in older clusters have faded and are much more difficult to study.
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Astronomers and have
Astronomers theorize that a collision with a smaller companion galaxy near the core of the main galaxy could have led to the unusual spiral structure.
Astronomers estimated that the visible fragments of SL9 ranged in size from a few hundred metres to two kilometres across, suggesting that the original comet may have had a nucleus up to acrosssomewhat larger than Comet Hyakutake, which became very bright when it passed close to the Earth in 1996.
Astronomers had expected to see the fireballs from the impacts, but did not have any idea in advance how visible the atmospheric effects of the impacts would be from Earth.
Astronomers have determined that it is between 6, 000 and 8, 000 years old ; it is approximately one light-year in diameter.
* Astronomers have reported that spectral class T brown dwarves ( the ones with the coolest temperatures ) are colored magenta because of absorption by sodium and potassium atoms of light in the green portion of the spectrum.
Astronomers do believe that the Ordovician – Silurian extinction, the third most destructive extinction on Earth, might have been due to a GRB.
Astronomers think that the sun had about 70 – 75 % of the present luminosity, yet temperatures appear to have been near modern levels even within 500 Ma of Earth's formation, which is puzzling ( the faint young sun paradox ).
Astronomers have used the name of Quaoar to name a large object in the Kuiper belt, 50000 Quaoar ( 2002 ), and the name of Weywot to name its satellite ( 2009 ).
Astronomers have long believed that the Magellanic Clouds have orbited the Milky Way at approximately their current distances, but evidence suggests that it is rare for them to come as close to the Milky Way as they are now.
Astronomers have been conducting surveys to locate the NEOs, many ( as of early 2007 ) funded by NASA's Near Earth Object ( NEO ) program office as part of their Spaceguard program.
Astronomers have directly observed protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula.
Astronomers have long thought it was quite likely that many undiscovered dwarf stars exist within 20 light years of Earth, as stellar population surveys show the count of known nearby dwarf stars to be lower than otherwise expected and these stars are dim and easily overlooked.
Astronomers have speculated that either intense star formation regions or active galactic nuclei ( which contain supermassive black holes ) may be responsible for the intense dust heating that produces this emission, although the general consensus is that both may be present in most ULIRGs.
Astronomers have paid particular attention to whether earthshine measurement can detect the red edge, a spectral feature that is due to the plants.
Astronomers have postulated that this fluctuating emission comes from the first known intermediate-mass black hole, of roughly 200 to 5000 solar masses.
Astronomers using the Hale Telescope have discovered distant objects at the edges of the known universe called quasars and have given us the first direct evidence of stars in distant galaxies.
Astronomers announce this as evidence that the theory of the cosmological constant proposed, but later discarded, by Einstein may have been right after all.
Astronomers usually express distances in units of parsecs ; light-years are used in popular media, but almost invariably values in light-years have been converted from numbers tabulated in parsecs in the original source.
Astronomers have a number of observational tools that they can use to make measurements of the heavens.
Astronomers have dubbed this object as the Twin Jet Nebula because of the polar jets believed to cause the shape of the lobes.
Astronomers in societies which have alternate traditional names for the planets may use those names in scientific discourse.
Astronomers and made
Astronomers had made careful photometric measurements of several stars known to be orbited by planets, in the hope that they might observe a dip in brightness caused by the transit of the planet across the star's face.
Astronomers have made several attempts to link the star to unusual astronomical events, such as a conjunction of Jupiter and Saturn, a comet or a supernova.
Astronomers using the telescope discovered the first evidence for a supermassive black hole ( Sgr A *) at the centre of the Milky Way, and made the first optical observation of a gamma-ray burst.
Astronomers had made careful photometric measurements of several stars known to be orbited by planets, in the hope that they might observe a dip in brightness caused by the transit of the planet across the star's face.
Astronomers have maintained its 12. 5 cm ( 5-inch ) telescope ( made in 1882 by Grubb in Dublin ) in good condition throughout its nearly 125-year history.
Astronomers theorized that it could have been a supernova, but the unique filtering properties of the foreground galaxy made it difficult to decide definitively.
Astronomers made over 104, 000 observations using the IUE, of objects ranging from solar system bodies to distant quasars.
Astronomers reject the idea of Nibiru, and have made efforts to inform the public that there is no threat to Earth in 2012.
Astronomers and find
In an interview with Christianity Today, Jastrow said " Astronomers now find they have painted themselves into a corner because they have proven, by their own methods, that the world began abruptly in an act of creation to which you can trace the seeds of every star, every planet, every living thing in this cosmos and on the earth.
* Astronomers claim first ' dark galaxy ' find
* Astronomers find star-less galaxy ( BBC News ), 2005
Astronomers and brown
* Astronomers have directly confirmed the existence of an extrasolar planet orbiting the brown dwarf numbered 2M1207a.
Astronomers and dwarfs
Astronomers considered many distinct classes of objects, including white dwarfs, pulsars, supernovae, globular clusters, quasars, Seyfert galaxies, and BL Lac objects.
Astronomers initially ruled out the possibility that some of the point-like objects are white dwarfs, because they are too blue to be consistent with theories of white dwarf evolution prevalent at the time.
Astronomers for many years ruled out red dwarfs as potential abodes for life.
Astronomers and other
Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space.
The Jalali calendar was introduced by Omar Khayyám alongside other Mathematicians and Astronomers in Nishapur, today it is one of the oldest calendars in the world as well as the most accurate solar calendar in use today.
Astronomers theorize that the gravity of one star pulls some of the gas from the surface of the other and flings it into a thin, dense disk extending into space.
Astronomers have been discovering " extrasolar " planets ( planets that orbit stars other than the Sun ) the last few years.
Radhakrishnan was one of the most respected Radio Astronomers in the world during his time, in that he was associated in one capacity or other with the world ’ s biggest radio telescopes.
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