Sentences with phrase «of chondrules»

That was part of the title of a session on the formation of chondrules at the 75th annual Meteoritical Society meeting last year.134

To get a better sense of the role of chondrules in a fledgling solar system, the researchers first simulated collisions between protoplanets — rocky bodies between the size of an asteroid and the moon.

Johnson predicts that oblique impacts, or collisions occurring at an angle, may be even more efficient at producing molten plumes of chondrules.

Previous experiments in the lab have shown that chondrules cool down at a rate of 10 to 1,000 kelvins per hour — a rate that would produce the texture of chondrules seen in meteorites.

moment where I realized that jetting during these really big impacts could possibly explain the formation of chondrules,» Johnson says.

There is some evidence that small clumps are the fundamental building blocks: Many asteroids are made of chondrules, small beads on the scale of a centimeter or less.

Here we report the discovery of a chondrule fragment embedded in a CAI.»

Not exact matches

The vast majority are chondrites, pieces of asteroids filled with little glassy beads called chondrules.

These meteorites are made of a mixture of solid chondrules, millimeter - sized beads (the approximate width of a penny) that became embedded in a fluffy matrix.

«Only the spikes in temperature derived from the chondrule formation models can explain today's low amount of carbon on the inner planets.

However, researchers at MIT and Purdue University have now found that chondrules may have played less of a fundamental role.

Residual droplets would eventually cool to form chondrules, which in turn attached to larger bodies — some of which would eventually impact Earth, to be preserved as meteorites.

They found that bodies the size of the moon formed relatively quickly, within the first 10,000 years, before chondrules were thought to have appeared.

In fact, the researchers found that chondrules were most likely created by the collision of such moon - sized planetary embryos: These bodies smashed together with such violent force that they melted a fraction of their material, and shot a molten plume out into the solar nebula.

«Chondrules were long viewed as planetary building blocks,» states Maria Zuber, Professor of Geophysics and MIT's vice president for research.

The simulations suggest that planetary bodies the size of the moon existed prior to the creation of the earliest chondrules, and that it was the enormous pressures produced by a collision between two such bodies that were responsible for the formation of the glassy spheres.

During the simulations, it was found that the planetary bodies would have to strike each other at a rate of 2.5 km (1.6 miles) per second to produce an impact plume with molten droplets that would cool at the correct rate to create chondrules with the characteristics we observe today.

Naoyuki Fujii and Masamichi Miyamoto, «Constraints on the Heating and Cooling Processes of Chondrule Formation,» Chondrules and Their Origins, editor Elbert A. King (Houston: Lunar and Planetary Institute, 1983), pp. 53 — 60.

Although chondrules evolved in outer space where temperatures are almost -460 °F (492 °F below freezing), they required sudden melting temperatures of at least 3,000 °F.

How would you like your decades of research on a field's central problem to be summed up by the statement that «these objects [chondrules] remain as enigmatic as ever»?

Because chondrules still contain volatile substances that would have bubbled out of melted rock, chondrules must have melted and cooled quite rapidly135 — in about one - hundredth of a second.136