Farther away in the disk, ices that haven't been vaporized by the star and more gas combine to
form giant gas planets.
Not exact matches
Ask an astronomer how planets
form, and she'll say parts of a
giant wheel of
gas and dust around a newborn star, called a protoplanetary disk, somehow collapse into blobs.
And what causes a rocky planet to
form as opposed to a
gas giant?
Flying in egg - shaped orbits, each one lasting 14 days, Juno also will look for evidence that Jupiter has a dense inner core and measure how much water is in the atmosphere, a key yardstick for figuring out how far away from the sun the
gas giant formed.
Our analysis strongly suggests we are observing a disk of hot
gas that surrounds a
forming giant planet in orbit around the star.
«This result is unique because it demonstrates that a
giant planet can
form so rapidly that the remnant
gas and dust from which the young star
formed, surrounding the system in a Frisbee - like disk, is still present,» said Lisa Prato of Lowell Observatory, co-leader of the young planet survey and a co-author on the paper.
Only rocky, sturdy planets could
form nearby;
giant planets would
form farther out, where ices and cool
gases could gather together.
According to previous predictions,
giant planets that
form through gravitational collapse of
gas should complete their general formation within 100,000 years.
«The
gas giants must have
formed by 4 million years after the formation of the solar system,» Weiss says.
One suggests that
giant planets
formed from the gravitational collapse of condensing
gas, like the sun did.
Because their gravitational grip is weak, the
gas could have been pushed out before many stars could
form; a few
giant stars may have blasted it out with their fierce heat and explosive deaths, for example.
It seemed inconceivable that a
gas giant could have
formed in such a location.
Nobody had ever anticipated the existence of such «hot Jupiters,» but Boss's models quickly suggested how these and other
gas giants might have
formed.
The inner parts of the planet - spawning disks of
gas and dust surrounding new - born stars are not believed to contain enough mass to
form giant planets.
One controversial theory posits that
giant planets might not need rocky cores if they
form directly from unstable whorls of
gas in the nebula around a young star.
«We know that these showers are linked to the jets because they're found in filaments and tendrils that wrap around the jets or hug the edges of
giant bubbles that the jets have inflated,» said Tremblay, «And they end up making a swirling «puddle» of star -
forming gas around the central black hole.»
To date, all exoplanets discovered in orbit around double stars are
gas giants, similar to Jupiter, and are thought to
form in the icy regions of their systems.
As astronomers report online today in Nature, magnetic fields inside M33's six most massive
giant molecular clouds — large concentrations of dense
gas and dust that give birth to stars — line up with the spiral arms, suggesting the magnetic fields helped create the huge clouds and that they regulate how the clouds fragment to
form new stars.
Most clusters in the universe today are dominated by
giant elliptical galaxies in which the dust and
gas has already been
formed into stars.
Early, fast, turbulent mixing of
gas within
giant molecular clouds — the birthplaces of stars — means all stars
formed from a single cloud bear the same unique chemical «tag» or «DNA fingerprint,» write astrophysicists.
Signs of water in a
gas giant exoplanet's atmosphere suggest the world
formed much closer to its star than
gas giants in our solar system did
Current theory holds that
giant planets can
form only at comparatively great distances from a star, where cold temperatures allow ice and frozen
gases to gather together.
With their
gas depleted, it may be impossible for the disks around stars in massive clusters to
form giant planets like Jupiter or Saturn.
Both low - and high - mass clusters
form within larger complexes of
gas and dust called
giant molecular clouds.
This result confirms that
gas giant planets
form rapidly within disks and validates the use of disk structures as fingerprints of embedded planets.
Now, a new, computer simulation — based study suggests that these
giants were
formed and fed by massive clouds of
gas sloshing around in the aftermath of the big bang.
Another embryonic
giant planet could easily have
formed there, only to be booted outward by a gravitational kick from another
gas giant.
The
gas giant has put on a beautiful light show in the
form of auroras at its north pole.
Based on humankind's admittedly limited experience, habitability seems to mean a small world — a terrestrial planet rather than a
gas giant like Jupiter or Saturn — orbiting its star at a comfortable «Goldilocks» distance that allows water to persist in liquid
form.
Astrophysicists believe that stars
form from the gravitational collapse of
giant clouds of
gas and dust.
The vast bubbles, Ferguson says, are
gas blown out by supernovas or stellar winds; the jets are being expelled by newly
forming giant stars.
OBSERVATIONS of a Neptune - like exoplanet show that it has a watery atmosphere — suggesting it
formed closer to its star than did the
gas giants in our solar system.
The
gas giants were
formed by accreting
gas from the protoplanetary disc that surrounded the sun.
In the prevailing theory of planet formation, called core accretion, dust grains stick together to
form rocky worlds, and some of these rocky bodies then grow massive enough to attract surrounding
gas, becoming
gas giants like Jupiter.
HAT - P - 26b's relative lack of heavy elements may indicate that it
formed closer to its star than
gas giants like Neptune or Jupiter.
So the conclusion was the
gas -
giant cores must have
formed before dissipation of the solar nebula — the gaseous circumstellar disk surrounding the young sun — which likely occurred between 1 million years and 10 million years after the solar system
formed.
«Jupiter is the oldest planet of the solar system, and its solid core
formed well before the solar nebula
gas dissipated, consistent with the core accretion model for
giant planet formation.»
If it accumulates this material quickly enough, the gaseous atmosphere may become too massive and collapse, beginning a rapid
gas accretion phase
forming a
gas giant.
The gravity of the outer
gas giants quickly drew these elements in, bloating them into their current
forms: solid cores of rock and ice covered with
gas.
[1] Earlier examples of ALMA research have been described in press releases such as «ALMA Sheds Light on Planet -
Forming Gas Streams — Tantalizing signs of flows feeding gas - guzzling giant planets,» «Sweet Result from ALMA — Building blocks of life found around young star.&raq
Gas Streams — Tantalizing signs of flows feeding
gas - guzzling giant planets,» «Sweet Result from ALMA — Building blocks of life found around young star.&raq
gas - guzzling
giant planets,» «Sweet Result from ALMA — Building blocks of life found around young star.»
A
giant star starts its life innocently, when
gas and dust buckle under an assertive gravitational pull to
form a baby star.
Here's another finding, courtesy of Juno: Unlike Saturn's enigmatic hexagonal (six - sided polygon) cloud structure over the ringed
gas giant's north pole, Jupiter's northern cyclones
form an octagonal (eight - sided) grouping.
As for how it was
formed, astronomers are stumped as a planet of that size would usually turn into a
gas giant (like Jupiter) in the early stages of formation.
«We see that all the hydrogen
gas in this region of the Galaxy is disturbed, with many smaller outflows closer to the plane of the Galaxy and then a
giant plume of
gas that
forms a sort of cap on the whole thing,» Pidopryhora said.
Flying in egg - shaped orbits, each one lasting 14 days, Juno also will look for evidence that Jupiter has a dense inner core and measure how much water is in the atmosphere, a key yardstick for figuring out how far away from the sun the
gas giant formed.
In stark comparison, HAT - P - 26b has a metallicity of just 4.8 times that of the Sun, suggesting that not only is it closer to the
gas giants in composition but also that it likely
formed closer to its host star than the planets of a similar size in our own system.
Stars and planets, scientists believe, are
formed when
giant clouds of
gas and dust collapse.
This image made from data obtained with the NASA / ESA Hubble Space Telescope reveals the dust lanes and star clusters of this
giant galaxy that give evidence that it was
formed from a past merger of two
gas - rich galaxies (Credit: NASA, ESA, and The Hubble Heritage Team (STScI / AURA)-RRB-
This material gathers into huge turbulent reservoirs of cool, low - density
gas, extending more than 30 000 light - years from the galaxy's star
forming region [3] These turbulent reservoirs of diffuse
gas may be of the same nature as the
giant glowing haloes seen around distant quasars..
Some of these cosmic rocks then smash together to
form rocky planets, like Earth, or the cores of
gas -
giant planets like Jupiter.