Besides explaining the estimated differences in ages
between gas giants such as Neptune and Uranus and rocky worlds such as Earth and Venus, the new findings help explain how gas - swaddled super-Earths — ones possibly shrouded with inhospitable atmospheres — were banished from an otherwise inhabitable neighborhood.
The spacecraft's final 22 orbits, dubbed the Grand Finale, sent Cassini into the potentially dangerous region
between the gas giant and its rings, and its final orbit sent it directly into Saturn's atmosphere.
Both objects formed among the rocky and icy protoplanets beyond the Solar System's «ice line» now located around 2.7 AUs, but the early development of Jupiter apparently prevented such large protoplanets
between the gas giant and planet Mars from agglomerating into even bigger planetary bodies, by sweeping many into pulverizing collisions as well as slinging them into the Sun or Oort Cloud, or even beyond Sol's gravitational reach altogether.
Not exact matches
The recent agreement
between oil - and -
gas giants BP and Rosneft to explore and develop the hydrocarbons of the Russian Arctic brought the long - term potential of northern development back into the global spotlight.
The gravitationally sticky stuff catches galaxies and causes
gases to adhere to filaments, which stretch
between the star clusters in a
giant cosmic web.
At just under eight times the mass and twice the size of our own world, 55 Cancri e is a welterweight that straddles the hazy boundary
between terrestrial and
gas -
giant planets.
This means that the sun, Earth and Jupiter line up, with Earth sitting
between the sun and the
gas giant.
«It proves that there is no clear dividing line
between rocky worlds like Earth and fluffier planets like water worlds or
gas giants.»
And Jupiter's great mass ensures that only asteroids occupy the orbit
between it and Mars; anything larger gets ejected from the area by the
gas giant's gravity.
«It's very interesting, because NGTS is just filling the gap we have at the moment»
between rocky planets and
gas giants, says astronomer Isabelle Baraffe of the University of Exeter in the United Kingdom, who is not involved in the project.
The
gas giant is on a near - collision course with your planet, thanks to gravitational tugs
between the planets in your system.
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.
Cassini Makes 8th Dive Through Saturn's Rings: The Cassini spacecraft has made its eighth dive
between Saturn and its rings, documenting the planetary system up close as it prepares for its Grand Finale plunge into the
gas giant on Sept. 15.
Ice lines are thought to delineate the transition
between rocky planets and
gas giants.
Before Kepler, plenty of Jupiter - sized worlds could be seen, but with its precision eye for spotting the tiniest of fluctuations of star brightness (as a small exoplanet passes
between Kepler and the star), the space telescope has found that smaller exoplanets outnumber the larger
gas giants.
Tidal interactions
between close - in,
gas -
giant exoplanets and their host star should cause the orbits of the planets to decay.
And, before its fatal plunge through the
gas giant's atmosphere, the spacecraft will repeatedly dive through the space
between Saturn and its rings, providing scientists best - ever views of the gigantic structures.
Led by Lars A. Buchhave, from CfA, the study shows a connection
between the orbital period of the planet and its size as it changes from a rocky planet to a
gas giant.
Ideally, it should measure
between half and twice the size of Earth, but the important thing is that it's massive enough to hold an atmosphere but not so big that it bloats into a
gas giant like Jupiter or an ice
giant like Neptune.
There is great variation in the length of day
between the planets, with Venus taking 243 Earth days to rotate, and the
gas giants only a few hours.
Not only did the Cassini spacecraft manage to survive its first dive
between Saturn and its rings on Wednesday, but it managed to obtain the closest images of the
gas giant's atmosphere to date — including a picture of what...
A collision
between two large galaxies is usually the cause of such starburst phases, where the cold
gas residing in the
giant molecular clouds becomes the fuel for sustaining such high rates of star formation.
«SPH is often utilized to model interactions
between forming
gas giant planets and their precursor disks,» says the paper's lead author, Robin Canup, assistant director of the SwRI Space Studies Department in Boulder, Colorado.
Outnumbered, outgunned, and with their crippled vessel in a decaying orbit around a
gas giant, the Titanic's crew must choose
between saving themselves... or saving Humanity.
The piece centers on Secretary of State John Kerry's trip to China in July, and thus appropriately casts China's policy choices on greenhouse
gases and its deep dependence on coal in the broader context of the never - ending «you first» dance
between these two greenhouse -
gas giants.
Sunspot cycles and solar minima are finely ordered by quadrupole phase relationships
between Earth and Venus and the
gas giants.