Sentences with phrase «iron core»

Unlike the other rocky planets in our solar system, it has an immense iron core that makes up roughly 70 per cent of the planet's volume.

Earth and Mercury are both rocky planets with iron cores, but Mercury's interior differs from Earth's in a way that explains why the planet has such a bizarre magnetic field, UCLA planetary physicists and colleagues report.

The planet has a large iron core which generates a magnetic field about 1 percent as strong as that of the Earth.

The first hint that Earth actually had a solid iron core beneath a liquid layer came in 1929, after a magnitude - 7.8 earthquake shook New Zealand.

When an aging star about 10 times as massive as our sun runs low on light, easy - to - fuse elements, its nonfusing iron core collapses.

Its dense iron core takes up 42 per cent of its volume, its orbit is less circular than that of the other planets, and current planetary formation models predict Mercury should be closer to the sun and bigger, so we know we're missing something.

For instance, a catastrophic impact could have stripped away most of Mercury's rocky mantle, leaving the planet with its relatively huge iron core.

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Mercury has a large iron core which is most likely at least partially molten and generates a magnetic field about 1 % as strong as that of Earth's.

In order for Mercury's core to have stayed molten over some 4.5 billions of years since the planet first formed from agglomerating planetisimals, however, its mostly iron core must also contain a lighter element, such as sulfur, to lower the melting temperature of the core material.

IRON CORE Mercury's iron - rich core extends three - quarters of the way to the surface and makes up 60 percent of the planet's mass.

Earth, like the other terrestrial planets, consists of about one - third iron core by mass; its outer two - thirds is made of a lighter, nonmetallic shell of silicates.

Vesta, like Earth, has a complex internal structure, with a massive iron core and a mantle.

«Earth didn't have to make its own iron core,» Russell says.

Inside, however, there is a large iron core whose diameter is 3,600 to 3,800 km (about 2,200 to 2,400 miles).

The 16 Psyche asteroid is thought to be the leftover iron core of a planet stripped of its mantle in a giant collision.

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It might be produced from a partially molten iron core in the planet's interior.

Below the ice, scientists predict there's a layer of magnesium silicate perovskite (minerals also found in Earth's mantle) and then a liquid iron core.

Peridotite, which glows like a green cat's eye, is one of the most common minerals in the mantle, the slushy zone between Earth's stiff crust and dense iron core.

Previous astronomical observations suggested that Mercury contains more metal in proportion to its volume than Earth does but did not indicate whether all this metal was distributed evenly or concentrated in a huge iron core.

THE Earth's solid iron core may recycle itself every 100 million years, melting on one side and resolidifying on the other.

Despite being the smallest planet in the solar system (since Pluto was demoted from the ranks of the planets), Mercury has an abnormally large iron core.

These high pressures are thought to be found in the iron cores of rocky exoplanets that are between three and four times Earth's mass, Smith says.

Until well into the 20th century, most scientists believed Earth had a liquid iron core.

As scientists have learned more about the properties of iron, however, the sleek crystal hypothesis has been challenged by an opposite idea: that the iron core is a lumpy, layered wad.

Earth's magnetic field is generated in its liquid iron core, and this «geodynamo» requires a regular release of heat from the planet to operate.

It has an iron core and a thick, heat - trapping atmosphere.

However, Vlada Stamankovic of the German Aerospace Center in Berlin reckons it is too soon to rule out molten iron cores — and magnetic fields — for super-Earths.

Planets are thought to owe their magnetic fields to an iron core that is at least partly molten.

These structures could indicate that mantle plumes once rose from Venus» iron core to the outer layer, thus softening and weakening the planet's surface.

City - size planetesimals — rocky microworlds that clumped together in the solar nebula — smashed into our planet's surface at incredible velocities and seeped down to Earth's iron core, depositing yet more iron.

Planetary scientists think magnetic fields are produced by the churning of a planet's molten iron core.

From studies of the HED meteorites and from measurements of light reflected off the asteroid's surface, scientists have concluded that Vesta has a very planetlike nickel - iron core.

But if lighter material, like hydrogen, settles close to the iron core, it could block dense material from sinking deep enough to keep convection going, said O'Rourke, of Arizona State University in Tempe.

An exoplanet discovered 340 million light years away may shed some light on how Mercury got to be such a weird world — a tiny planet made mostly of an iron core

The biggest challenge of studying the planet's middle, biggest layer — sandwiched between its iron core and thin surface that hosts its living creatures — is that it can't been seen.

The new, high - resolution map of the mantle — the hot rock below Earth's crust but above the planet's iron core — not only shows these connections for many hotspots on the planet, but reveals that below about 1,000 kilometers the plumes are between 600 and 1,000 kilometers across, up to five times wider than geophysicists thought.

This process would let metal trickle down through the mantle, accumulate in the center, and form a metal core, like the iron core at the heart of our home planet.