Sentences with phrase «earth after its formation»

For one, the new data throw a wrench in the conventional story that carbonaceous chondrites — a water - rich variety of asteroid — delivered water to an initially dry Earth after its formation.

We know that comets bombarded Earth after its formation, and they brought a lot of water and more complex stuff to the young planet.

One possibility called out by the authors would be icy comets bombarding Earth after formation and delivering their own distinct cocktail of compounds and gases to an existing atmosphere evolved from a solar source.

Not exact matches

As these life forms established themselves over some hundreds of millions of years, the luxuriant foliage formed layer after layer of organic matter, which was then buried in the crust of the earth to become fossil formations with enormous amounts of stored energy.

Donald Yeomans, who calculates the orbits for near - Earth objects at NASA's Jet Propulsion Laboratory, says that comets flung out from that belt pummeled our planet shortly after its formation and could have left behind water, possibly creating the conditions that allowed Earth to become a cradle for life.

The platinum in your wedding ring and the gold in your dental fillings most likely arrived on Earth in a furious meteoric bombardment 200 million years after the planet's formation, University of Bristol geologist Matthias Willbold reports.

The IODP team wants to test a leading model for peak ring formation, in which granite from Earth's depths rebounds after a major impact, like water struck by stone, to form a central tower, taller than the crater rim.

We think the collision happened 50 million years after the formation of the solar system, and it was the last big event in the formation of Earth.

There are many possible sources for the components of Earth's primordial atmosphere, from the so - called solar nebula, a cloud of dust and gas leftover from the sun's formation, to comets and other impactors that may have delivered significant amounts of chemicals to Earth during or after the planet's formation.

Writing today (Feb. 23, 2014) in the journal Nature Geoscience, an international team of researchers led by University of Wisconsin - Madison geoscience Professor John Valley reveals data that confirm the Earth's crust first formed at least 4.4 billion years ago, just 160 million years after the formation of our solar system.

But the buildup of heat from the decay of radioactive elements in the interior then remelted parts of the mantle, which began to erupt onto the surface some 500 million years after the Moon's formation, pooling in impact craters and basins to form the maria, most of which are on the side of the Moon facing the Earth.

The 3.7 - billion - year - old structures may help scientists retrace the rise of the first organisms relatively soon after Earth's formation around 4.5 billion years ago (SN: 2/8/14, p. 16), the discoverers report online August 31 in Nature.

This model does not, however, explain one of the most puzzling features of this rapid deglaciation; namely the global formation of hundreds of metres thick deposits known as «cap carbonates», in warm waters after Snowball Earth events.

The oldest fragment of Earth's primeval crust is a zircon dated to be 4.4 billion years old, having formed less than 160 million years after planetary formation (more).

Under this model of ocean formation, rocky planets with 0.5 to five Earth - masses are likely to form oceans within the first 150 million years after formation.

As the zircons were radioactively dated to be as old as 4.25 billion years, the new findings suggest that carbon - based life may have been present on Earth within the first 300 million years after planetary formation, possibly as a «planetary mega-organism» in Earth's oceans (Michael Marshall, New Scientist, November 25, 2011).

The leading theory for Charon's formation is that it formed similar to the way that the Earth and Moon have formed: from the accumulated orbital debris that surrounded Pluto after a giant impactor hit the latter during the early history of the Solar System.

This chemical weathering process is too slow to damp out shorter - term fluctuations, and there are some complexities — glaciation can enhance the mechanical erosion that provides surface area for chemical weathering (some of which may be realized after a time delay — ie when the subsequent warming occurs — dramatically snow in a Snowball Earth scenario, where the frigid conditions essentially shut down all chemical weathering, allowing CO2 to build up to the point where it thaws the equatorial region, at which point runaway albedo feedback drives the Earth into a carbonic acid sauna, which ends via rapid carbonate rock formation), while lower sea level may increase the oxidation of organic C in sediments but also provide more land surface for erosion... etc..

Washington, DC — New work from a team including Carnegie's Hanika Rizo and Richard Carlson, as well as Richard Walker from the University of Maryland, has found material in rock formations that dates back to shortly after Earth formed.

There is also the prevailing theory that the moon was formed from a cataclysmic collision between proto - Earth and a solid impactor about 100 million years after our solar system's formation.

This model required that a later event (such as a second large impact) altered the Earth's spin after the Moon's formation.

The quantity and concentration of highly varied limestone formations is extraordinary in a global context, whilst the superbly exposed geology provides an insight into the recovery of marine life in the Triassic period, after the greatest extinction event recorded in the history of life on Earth.

One could assume that some time during and / or after earth formation, earth was much hotter than it is now.