Sentences with phrase «of rocky material»

«Spectroscopic observations of the white dwarf allowed us to measure the abundances of the rocky material as it is being accreted and filtered through the star's atmosphere in real time,» Melis said.

In a protoplanetary cloud around a young star there would be tiny grains of rocky material that would provide a surface on which chemicals could react.

Models of Jupiter's interior suggest it has a solid core of up to 18 Earth - masses» worth of rocky material — just about 6 percent of Jupiter's total mass.

Models say that Jupiter should have captured about 70 million gigatonnes of rocky material, but less than half that amount remains as irregular moons.

Until then, all the known exoplanets (planets circling other stars) were big and gaseous, but this one is probably made of rocky materials — the first world like ours found in an alien solar system.

Not exact matches

Planets that were rocky from the start should be smaller close to the stars, where studies of other young star systems suggest there should have been less material available when these planets were forming.

The other suggests they arose in a two - stage process called core accretion, in which bits of material smashed and fused together to form bigger rocky, icy bodies.

The researchers also found that, compared with today's rocky material, the ancient crust was composed of much denser stuff, enriched in iron and magnesium.

What little rocky material occurs in today's ring system probably is the debris of collisions between icy ring particles and asteroids and comets swept up by the planet's huge gravitational field, says Canup.

The presence of this rock at a site indicates either that material has pushed up through Earth's crust from the mantle (a silicate rocky shell between the crust and the core with an average thickness of 2,886 km and depths ranging from 30 km to almost 3,000 km below the crust) or that a celestial body (a comet, meteor or meteorite) fell there.

Over the course of about 100 million years, most of the material in that nebulous cloud accreted into the existing eight planets — four rocky (including Earth) and four gaseous.

When later generations of stars form, some of that material congeals into rocky planets like Earth.

Thanks to the material from Güéjar Sierra in Granada that Boissier analysed, it was determined that the plant was typical of sandy substrates, often dolomitic (rocky), and was found in the provinces of Granada, Málaga and Jaén.

Powerful gravitational perturbations from the two stars on the rocky building blocks of planets lead to destructive collisions that grind down the material.

If Pluto's core was rocky and its mantle icy, most of the material blasted into space by the collision would have been ice, accounting for Pluto's high rock - to - ice ratio today.

Astronomers at the Universities of Cambridge and Warwick say this is the first «reliable evidence» for water - rich, rocky planetary material in any extrasolar planetary system.

They estimate that approximately 30 percent of the minor planet's mass was water and other ices, and approximately 70 percent was rocky material.

By learning about the layering of these materials, scientists can explain why some rocky planets turn into an «Earth» rather than a «Mars» or «Venus» — a factor that is essential to understanding where life can appear in the universe.

Building on past observations of the white dwarf called SDSSJ1043 +0855 (the dead core of a star that originally was a few times the mass of the Sun), which has been known to be gobbling up rocky material in its orbit for almost a decade, the team used Keck Observatory's HIRES instrument fitted to the 10 - meter Keck I telescope as well as data from the Hubble Space Telescope to measure and characterize the material being accreted by the star.

In addition to extending a relatively new method of determining the chemical composition of planets to examine their internal structure, the team found that the rocky material being accreted by the star could be comprised of minerals that are typically associated with marine life processes here on Earth.

Colliding at speeds up to 22,000 miles per hour (36,000 kilometers per hour), such a collision may have stripped most of the rocky mantle from the protoplanet that became Mercury with its iron - rich core, while a Mars - size protoplanet struck the early Earth off - center and created a spray of mostly mantle material that later accreted to form the Moon.

This material has been enriched by nuclear reactions deep within the star and includes many of the elements necessary for forming rocky planets like our Earth, such as silicon and magnesium, and which are also the basis for life.

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Henry uses torn cardboard surfaces as material starting points for his series of delicately - rendered, collaged drawings, and the resulting rocky scenes are at once irrepressibly American and bewitchingly other.

He gave us much of it, the integration of natural materials into the rocky Canadian landscape.