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A fifth giant planet was kicked out of the early solar system, according to computer simulations by a US-based planetary scientist. The sacrifice of this gas giant paved the way for the stable configuration of planets seen today, says David Nesvorný, who believes that the expulsion prevented Jupiter from migrating inwards and scattering the Earth and its fellow inner planets.

A fifth giant planet was kicked out of the early solar system, according to computer simulations by a US-based planetary scientist. The sacrifice of this gas giant paved the way for the stable configuration of planets seen today, says David Nesvorný, who believes that the expulsion prevented Jupiter from migrating inwards and scattering the Earth and its fellow inner planets.

Planetary migration poses a serious challenge to theories of planet formation...When multiple planets stir the disk, our simulations yield the new result that large-scale migration ceases. Thus, growing planets do not migrate through planetesimal disks....Although migration through a gaseous disk is an important issue for the formation of gas giants, we conclude that migration has little impact on the formation of terrestrial planets.

here's something we didn't consider yesterday in the meeting on extra-solar planets!

this is because you did not read the nature paper I have posted (see post a few lines below ...)

an experiment at the University of Pennsylvania. It might be a bit far-fetched but I thought it might be useful when exploring new planets. Combined with AI the robot would able to assess the terrain and deploy another robot the shape of which would be chosen to best suit its environment. I was thinking of this in the context of exploring places on other planets which are inaccessible by regular rovers (e.g. caves on Mars).

NASA (WPMI) Glowing a dark magenta, the newly discovered GJ 504b, a Jupiter-sized planet with four times the mass, is posing a challenge to scientist on how giant planets are formed.

for Francesco!

Interesting, but obviously something is wrong. How the big giants can remain still if the inner planets and the sun vanish at the same time !

Caltech researchers have found evidence of a giant planet tracing a bizarre, highly elongated orbit in the outer solar system. The object, which the researchers have nicknamed Planet Nine, has a mass about 10 times that of Earth and orbits about 20 times farther from the sun on average than does Neptune (which orbits the sun at an average distance of 2.8 billion miles).

The quest for finding Planet Nine is meant to stay apparently.

One more reason why we should be much more open about all these EO data we have .... The two citizen scientists, Kian Jek and Robert Gagliano, are listed as authors on the scientific paper recently published. I love this: the digital nature of these data make it far, far easier to analyze the science than it was in the past, and also easier to get the data out to people. Because of this, we have an explosive growth in these kinds of projects. Planet Hunters is great, but then so is Galaxy Zoo, Moon Mappers, Ice Hunters, and so many others. You can find several of these collected at the CosmoQuest website.

Wiktor is also collecting these science games in the ACT-wiki. You should have a look at: http://sophia.estec.esa.int/actwiki/index.php/On-line_Games_4_Science

An Earth-sized planet is found orbiting Alpha Centauri B in the closest star system from us!

The dwarf planet Ceres, one of the most intriguing objects in the solar system, is gushing water vapour from its unusual ice-covered surface, scientists said on Wednesday in a finding that raises the question of whether it might be hospitable to life.

General discussion on how to search for habitable planets

Lasers + diamonds --> simulate pressure of thousands of atmospheres on planetary cores!

As a side note, this is also being used as method to create a hypothetical substance called 'metallic hydrogen'. At such high pressures, hydrogen itself should become superconducting at room temperature and thus of tremendous interest...

A dwarf-planet candidate called UX25 and its tiny satellite could provide the first evidence of a new cosmological model that includes antigravity, say Alberto Vecchiato and Mario Gai of the Astrophysical Observatory of Turin in Italy.

Maybe an idea for the next GTOC? :)

It would be brilliant if an LBA twinsun kind of planet would be found. http://static.giantbomb.com/uploads/original/0/1468/180227-lba1twinsun.gif

The high seas of Mars may never have existed. According to a new study that looks at two opposite climate scenarios of early Mars, a cold and icy planet billions of years ago better explains the water drainage and erosion features seen today.

That's a lot of assumptions along the way, what do you think of it Nina?

Astronomers hunting for another Earth have found what may be the closest match yet, a potentially rocky planet circling its star at the same distance as the Earth orbits the Sun, NASA said Thursday.

discovery of a planet only 2.7 times larger than Earth