Stars: Their Life and Afterlife
... Superbubbles are large cavities of hot, low-density plasma that are created by the collective effects of a large number of massive stars. We saw earlier in the lecture series that stars tend to form in clusters as a giant molecular cloud contracts. This means that they not only tend to form close to ...
... Superbubbles are large cavities of hot, low-density plasma that are created by the collective effects of a large number of massive stars. We saw earlier in the lecture series that stars tend to form in clusters as a giant molecular cloud contracts. This means that they not only tend to form close to ...
assessing the massive young sun hypothesis to solve the warm
... a nonstandard solar model in which the Sun has lost significant mass over time. A more massive young Sun will have two effects. First, since stellar luminosity is mass dependent, a larger solar mass implies a correspondingly larger solar energy output. Second, owing to the existence of adiabatic inv ...
... a nonstandard solar model in which the Sun has lost significant mass over time. A more massive young Sun will have two effects. First, since stellar luminosity is mass dependent, a larger solar mass implies a correspondingly larger solar energy output. Second, owing to the existence of adiabatic inv ...
The Cosmic Perspective Formation of the Solar System
... Why do we think that the solar system formed from a rotating, collapsing gas cloud that ended up as a disk orbiting the Sun? a) Most of the planets revolve and rotate in the same direction and in the same plane. b) Conservation of angular momentum means a ...
... Why do we think that the solar system formed from a rotating, collapsing gas cloud that ended up as a disk orbiting the Sun? a) Most of the planets revolve and rotate in the same direction and in the same plane. b) Conservation of angular momentum means a ...
Presolar grain OC2
... 1. The O, Mg and Al composition of OC2 could be produced by an IM-AGB of Z≈Z, or by a LM-AGB of Z≈0.3 Z with efficient extra mixing. The large uncertainty in the Fe composition of OC2 does not allow us to determine which model is better, but the Cr composition favors the origin in an IM-AGB star. ...
... 1. The O, Mg and Al composition of OC2 could be produced by an IM-AGB of Z≈Z, or by a LM-AGB of Z≈0.3 Z with efficient extra mixing. The large uncertainty in the Fe composition of OC2 does not allow us to determine which model is better, but the Cr composition favors the origin in an IM-AGB star. ...
ESci. 420 - Our Solar System
... on the same page, we will embed questions-of-the-day within most lectures, and these will generally be given using the iclicker system, and in these cases results will usually be available on the course website within 24 hours. Every student is responsible for checking Canvas to ensure their QotD gr ...
... on the same page, we will embed questions-of-the-day within most lectures, and these will generally be given using the iclicker system, and in these cases results will usually be available on the course website within 24 hours. Every student is responsible for checking Canvas to ensure their QotD gr ...
NEW PARTICLES FROM NUCLEAR REACTIONS IN THE SUN Max
... to this process is shown in fig. 3 curve (B) as a function of X. We now consider decay of the axion. For orientation, fig. 3 curve (C) shows the reduction in the 5.5 MeV axion flux using exp(-Ro/l), l = [(Ea/ma) 2 - I ] 1/2r assuming that all axions come from the solar center. Using the solar model ...
... to this process is shown in fig. 3 curve (B) as a function of X. We now consider decay of the axion. For orientation, fig. 3 curve (C) shows the reduction in the 5.5 MeV axion flux using exp(-Ro/l), l = [(Ea/ma) 2 - I ] 1/2r assuming that all axions come from the solar center. Using the solar model ...
Like a boiling teakettle atop a COLD stove, the sun`s HOT outer
... themselves to neutralize it. And if a plasma cannot sustain an electric field, it cannot move relative to the magnetic field (or vice versa), because to do so would induce an electric field. This is why astronomers talk about magnetic fields being “frozen” into plasmas. This principle can be quantif ...
... themselves to neutralize it. And if a plasma cannot sustain an electric field, it cannot move relative to the magnetic field (or vice versa), because to do so would induce an electric field. This is why astronomers talk about magnetic fields being “frozen” into plasmas. This principle can be quantif ...
2. Velocity dispersions of galaxies
... which it entered on July 15, 1972, and to make direct observations of Jupiter, which it passed by on December 3, 1973. It was launched from Cape Canaveral Air Force Station's Launch Complex 36A on March 3, 1972 at 01:49:00 UTC. Pioneer 10 is heading in the direction of Aldebaran, located in Taurus. ...
... which it entered on July 15, 1972, and to make direct observations of Jupiter, which it passed by on December 3, 1973. It was launched from Cape Canaveral Air Force Station's Launch Complex 36A on March 3, 1972 at 01:49:00 UTC. Pioneer 10 is heading in the direction of Aldebaran, located in Taurus. ...
Document
... the rotating solar nebula collapsed into a disk, and the planets formed in that disk. Objects are co-eval (4.) 2. The division into small inner and giant outer planets rests upon the amount of solid material (mainly water ice and silicate rock) available in the inner/outer part of the disk. • There ...
... the rotating solar nebula collapsed into a disk, and the planets formed in that disk. Objects are co-eval (4.) 2. The division into small inner and giant outer planets rests upon the amount of solid material (mainly water ice and silicate rock) available in the inner/outer part of the disk. • There ...
supernova remnants
... • Reverse shock- information about the interaction with the ISM travels backwards into the SN ejecta ...
... • Reverse shock- information about the interaction with the ISM travels backwards into the SN ejecta ...
ASR201017 - UCLA IGPP
... Particles on field lines experiencing reconnection on the dayside move onto open field lines. As they interact with the regions of weak magnetic field near the reconnection regions they can be transported across magnetic field lines and energized by the electric field. The most energetic particles m ...
... Particles on field lines experiencing reconnection on the dayside move onto open field lines. As they interact with the regions of weak magnetic field near the reconnection regions they can be transported across magnetic field lines and energized by the electric field. The most energetic particles m ...
PHY320 Glossary of Terms - The University of Sheffield
... is used as a model when estimating the chemical composition of the Earth. Cosmic Rays are the particles which impinge on the top of the Earth's atmosphere. They are one of the sources of information about the relative abundances of elements in the Universe. Although they are predominantly protons, t ...
... is used as a model when estimating the chemical composition of the Earth. Cosmic Rays are the particles which impinge on the top of the Earth's atmosphere. They are one of the sources of information about the relative abundances of elements in the Universe. Although they are predominantly protons, t ...
Advanced Composition Explorer
Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997 and entered a Lissajous orbit close to the L1 Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters at right are only approximate. The spacecraft is still in generally good condition in 2015, and is projected to have enough fuel to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.