For those of you scoring at home, "planetesimals" were the first solid objects in our newly minted solar system (also known as the protoplanetary disk). From Wordnik.com. [News and Features - NASA's Jet Propulsion Laboratory] Reference
AFAIU bodies in the protoplanetary disk accrete by collisions. From Wordnik.com. [New Hubble Images Show Pluto is Changing | Universe Today] Reference
"We need to see through gas and dust to see star formation and protoplanetary disks" – here's Spitzer. From Wordnik.com. [No Moon Missions, That's a Relief | Universe Today] Reference
In itself, this is very exciting because nearly half of T Tauri stars have circumstellar disks or protoplanetary discs. From Wordnik.com. [Capture A FUor! | Universe Today] Reference
Smaller dust grains within the disk capture some of the UV radiation in the early formation periods of a protoplanetary disk. From Wordnik.com. [How Water Protected Our Molecules | Universe Today] Reference
Besides PSR B1257+12, at least one other pulsar planet is known PSR B1620+26 and a protoplanetary disk was revealed around the magnetar 4U 0142+61. From Wordnik.com. [Second Smallest Exoplanet Found | Universe Today] Reference
Using Hubble's Advanced Camera for Surveys ACS, researchers have discovered 42 protoplanetary blobs, which are being illuminated by a bright star cluster. From Wordnik.com. [Hubble Captures Birth, Annihilation of Young Solar Systems in Orion Nebula | Universe Today] Reference
It clearly showed a ring of protoplanetary debris approximately. From Wordnik.com. [Daily news] Reference
Lee Hartmann: This is about the oldest planetary or protoplanetary disk. From Wordnik.com. [Universe Today] Reference
Only a few stars less massive than the Sun retain their protoplanetary disks. From Wordnik.com. [Impact Lab] Reference
Previous studies indicated that protoplanetary disks disappear within 10 million years. From Wordnik.com. [Universe Today] Reference
Right: An artist's concept of a protoplanetary disk where young planets are being born. From Wordnik.com. [Science @ NASA] Reference
Reconstitute, for example, the HD 69830 protoplanetary disk or the 55 Cnc protoplanetary disk. From Wordnik.com. [systemic] Reference
"We were able for the first time to image the protoplanetary disks around these young stars," says O'Dell. From Wordnik.com. [Scientific American] Reference
When the protoplanetary disk begins to dissipate, planets are left behind, safe from impact with their parent star. From Wordnik.com. [dailyindia.com News Feed] Reference
The VLBA yielded even sharper images than the famous Hubble photos of "proplyds," or protoplanetary disks in Orion. From Wordnik.com. [D Mag - News] Reference
They found that all stars with the mass of the Sun or greater have lost their protoplanetary (planet-forming) disks. From Wordnik.com. [Impact Lab] Reference
It clearly showed a ring of protoplanetary debris approximately 21.5 billion miles across and having a sharp inner edge. From Wordnik.com. [About.com Space / Astronomy] Reference
Lee Hartmann of the University of Michigan, an expert in protoplanetary disk evolution, says the work is an important step. From Wordnik.com. [Latest Science News Features, Blog Entries, Column Entries, Issues, Articles and Book Reviews] Reference
This suggests HR 8799 might have once possessed an extremely dense protoplanetary disk that could have dragged planets around. From Wordnik.com. [Yahoo! News: Business - Opinion] Reference
It found protoplanetary disks, clumps of gas and dust around young stars that likely function as birthing grounds for new planets. From Wordnik.com. [ News] Reference
Scientists think planets are born from protoplanetary disks through gravitational and electrostatic interactions between particles. From Wordnik.com. [Space News From SpaceDaily.Com] Reference
What astronomers had expected to be a run-of-the-mill protoplanetary disk turned out to be evidence of a much more intriguing story. From Wordnik.com. [Universe Today] Reference
Studies of protoplanetary disks and young solar systems will benefit greatly from the groundbreaking new capabilities of ALMA, Wilner said. From Wordnik.com. [Spaceflight Now] Reference
Just a few thousands of years after the early Sun appeared from a collapsed cloud of space gas and dust, a protoplanetary disk started forming around it. From Wordnik.com. [Softpedia News - Global] Reference
One school of thought suggests that the Earth acquired its surface water from asteroids or asteroid-like bodies that were present in its protoplanetary disk. From Wordnik.com. [Space News From SpaceDaily.Com] Reference
The discoveries, appearing in the Astrophysical Journal, provide a better understanding of the way hydrogen gas from the protoplanetary disk is incorporated into the star. From Wordnik.com. [Daily News & Analysis] Reference
Researchers think this behavior is common in other disk systems, such as spiral galaxies including our own Milky Way, and in protoplanetary disks found around nearby stars. From Wordnik.com. [Yahoo! News: Business - Opinion] Reference
They find that carbon remained in a gaseous state within the protoplanetary disk and was eventually blown out into deep space; the embryonic Earth wound up with none at all. From Wordnik.com. [Scientific American] Reference
Morris says the outcome of this study shows only that, based on the computer models, it should be possible to detect the presence of phyllosilicates in protoplanetary disks. From Wordnik.com. [Space News From SpaceDaily.Com] Reference
Climate change is perfectly natural and has gone on since the earth formed from protoplanetary mass, and that change is driven by the sun, something we can do nothing about. From Wordnik.com. [Latest Articles] Reference
However, it would appear that one of the main reasons why life appeared from that chaotic protoplanetary disk was the fact that portions of it were protected by water vapors. From Wordnik.com. [Softpedia News - Global] Reference
However, dust is only 1\% of the total mass of protoplanetary disks, while gas is their main component (99\%) and may be responsible for the structure of forming planetary disks. From Wordnik.com. [Scientific Blogging] Reference
Artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. From Wordnik.com. [Shedding Light on the Sun's "Lithium Mystery" Artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. Credit: ESO – Universe Today] Reference
November 11th, 2009Artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. From Wordnik.com. [Shedding Light on the Sun's "Lithium Mystery" Artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. Credit: ESO – Universe Today] Reference
Artist's concept of a protoplanetary disk. From Wordnik.com. [Scientific Blogging] Reference
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