Sentences with phrase «large planetary cores»

Although dynamos are thought to require large planetary cores, it's possible that the molten cores of these small bodies may have churned vigorously enough to generate magnetic fields, he says.

Not exact matches

Gas giants are probably born further out, beyond some 400 million kilometers, where ice crystals can develop and accumulate into planetary cores that are massive enough to attract large amounts of gas from the disk.

This has puzzled astronomers for decades, as conventional planetary formation models can not produce such a relatively large core.

H. Bond (STSci), R. Ciardullo (PSU), WFPC2, HST, NASA — larger image (Gacrux may have a white dwarf companion B, a remnant stellar core that has already cast off its outer gas layers, like planetary nebula NGC 2440.)

Extending to about 85 percent of the planetary radius, this core larger than previous estimates.

As a result, Vesta «differentiated» into a relatively dense metallic core (of approximately 136 miles or 220 kilometers across), lighter mantle, and crust, like the rocky inner planets, many large planetary satellite's like the Earth's Moon, and probably most, if not all, of the newly named «dwarf planets» like Ceres.

H. Bond (STSci), R. Ciardullo (PSU), WFPC2, HST, NASA — larger image (White dwarfs are remnant stellar cores that have cast off their outer gas layers, like planetary nebula NGC 2440)

Re # 173 (Dan Allan): Large - scale reasons for the chaos include planetary tilt (= seasons), a high rate of rotation (= major Coriolis effect), much more solar heat applied at the equator than at the poles, unevenly distributed land, air and water, a molten core resulting in tectonic activity including continental drift and volcanos, the occasional hammer from space, a really large satellite creating major tides in addition to minor ones from the sun, plus some stuff I'm probably forgetLarge - scale reasons for the chaos include planetary tilt (= seasons), a high rate of rotation (= major Coriolis effect), much more solar heat applied at the equator than at the poles, unevenly distributed land, air and water, a molten core resulting in tectonic activity including continental drift and volcanos, the occasional hammer from space, a really large satellite creating major tides in addition to minor ones from the sun, plus some stuff I'm probably forgetlarge satellite creating major tides in addition to minor ones from the sun, plus some stuff I'm probably forgetting.