Sentences with phrase «grains of dust formed»

New research from the Niels Bohr Institute at the University of Copenhagen and Aarhus University shows that not only can grains of dust form in gigantic supernova explosions, they can also survive the subsequent shockwaves they are exposed to.

Not exact matches

«The problem has been that even though dust grains composed of heavy elements would form in supernovae, the supernova explosion is so violent that the grains of dust may not survive.

Within these clouds, on the surfaces of tiny dust grains, hydrogen atoms link with oxygen to form water.

These saturated organic molecules are formed in interstellar space and are preserved on the surfaces of dust grains.

The dust in the gas cloud that formed comets and the rest of the solar system is thought to consist of amorphous glass - like grains instead.

Looking at Comet ISON's chemical fingerprints — its ratio of carbon dioxide to water, its mix of different kinds of hydrogen atoms, the kind of dust grains it contains — will indicate where it formed 4.56 billion years ago, and thus put the wandering - Jupiter theory to the test.

The dust grains that float through our solar system contain the ingredients to make water, which forms when the dust is zapped by a blast of charged wind from the sun.

New work from a team of Carnegie cosmochemists published by Science Advances reports analyses of carbon - rich dust grains extracted from meteorites that show that these grains formed in the outflows from one or more type II supernovae more than two years after the progenitor stars exploded.

For this study, the team set out to investigate the timing of supernova dust formation by measuring isotopes — versions of elements with the same number of protons but different numbers of neutrons — in rare presolar silicon carbide grains with compositions indicating that they formed in type II supernovae.

Rather, they analyzed microscopic silicon carbide, SiC, dust grains that formed in supernovae more than 4.6 billion years ago and were trapped in meteorites as our Solar System formed from the ashes of the galaxy's previous generations of stars.

Silvia is optimistic, noting that most of the dust is in the form of large, robust grains.

Its centre ignited to make the sun, while farther out grains of dust slowly coalesced to form larger and larger solid bodies.

Simulations by Nora de Leeuw of University College London and colleagues suggest that the dust grains from which Earth formed had such a tenacious grip on water that they could have held onto the molecules despite the high temperatures.

Weaver's models also demonstrate that once the temperature in the dust cloud reaches about — 280ºF, most of the molecules evaporate from the ice on dust grains and enter a gas phase, allowing them to react a lot more quickly and to form complex molecules.

In the prevailing theory of planet formation, called core accretion, dust grains stick together to form rocky worlds, and some of these rocky bodies then grow massive enough to attract surrounding gas, becoming gas giants like Jupiter.

Applying aperture photometry on the azimuthally averaged deconvolved PACS images and using a modified blackbody of the form Bν · λ − β, as expected for a grain emissivity Qabs ~ λ − β with β equal to 1.2 (representing amorphous carbon, Mennella et al. 1998), we derived a dust temperature between 108 ± 5 K at 20 ′ ′ and 40 ± 5 K at 180 ′ ′.

[2] The ejected shell formed around AGB stars is composed of gas and dust grains.

I apply numerical models to investigate the physical and chemical evolution of planetary materials, ranging from the small dust grains suspended in protoplanetary disks to the many kilometer - scale objects which accrete together to form planets.

While other species detected in space are formed by gas - phase chemistry alone, or by a combination of both gas and solid - phase generation, methanol is a complex organic compound which is formed solely in the ice phase via surface reactions on dust grains.

Each of those holes had formed when a grain of cosmic dust smacked into the surface of the moon.

The impinging photons warm dust grains, resulting in a lower probability of forming and maintaining complex organic molecules.

After six months of work, the team formed by CSIC staff and the LuzLux production company, among others, has completed the documentary «Nanocosmos, a journey to the origins of dust grains, a road movie which talks about the technological and human challenge that lies behind the development of instruments in the area of Laboratory Astrophysics.

Astronomers believe that planets form like snowballs over millions of years, as small dust grains clump together to form larger bodies.

It was a detailed portrait of a so - called protoplanetary disk, made up of gas and dust grains, associated with a young star — the kind of structure out of which planets could be expected to form.