The Habitability of Our Earth and Other Earths: Astrophysical
... Chlorophyll maps of the ocean (McClain et al. 2006) show regions where, despite ample water, photons, and nitrates, there are low concentrations of chlorophyll. Iron fertilization experiments in these enigmatic high-nitrate-low-chlorophyll regions found that the biomass was iron limited, rather than ...
... Chlorophyll maps of the ocean (McClain et al. 2006) show regions where, despite ample water, photons, and nitrates, there are low concentrations of chlorophyll. Iron fertilization experiments in these enigmatic high-nitrate-low-chlorophyll regions found that the biomass was iron limited, rather than ...
An Eclectic View of our Milky Way Galaxy
... for mapping spiral arms. Proper motion data in conjunction with the newly-estimated velocity components for the Sun’s motion imply a distance to the Galactic centre of R0 = 8.34 ± 0.27 kpc , consistent with recent estimates which average 8.24 ± 0.09 kpc. A cosinusoidal Galactic potential is not rule ...
... for mapping spiral arms. Proper motion data in conjunction with the newly-estimated velocity components for the Sun’s motion imply a distance to the Galactic centre of R0 = 8.34 ± 0.27 kpc , consistent with recent estimates which average 8.24 ± 0.09 kpc. A cosinusoidal Galactic potential is not rule ...
Astronomy 1 – Introductory Astronomy Spring 2014
... The Ecliptic and Zodiac Constellations The ecliptic is a path the Sun appears to travel with respect to the stars over the course of the year. (The Moon and planets also appear to move through the sky on or near the ecliptic, as well.) In antiquity, astronomers noticed that the Sun “passed through” ...
... The Ecliptic and Zodiac Constellations The ecliptic is a path the Sun appears to travel with respect to the stars over the course of the year. (The Moon and planets also appear to move through the sky on or near the ecliptic, as well.) In antiquity, astronomers noticed that the Sun “passed through” ...
Summer 2014 Mercury - Astronomical Society of the Pacific
... Galileo in January 1610. Of course, this Simon Marius [Source: Wikipedia] led Galileo to accuse Marius of plagiarism in his Il Saggiatore in 1623. Galileo strenuously insisted that Marius obtained his knowledge of the satellites from his (Galileo’s) book. Being by now the most famous astronomer in E ...
... Galileo in January 1610. Of course, this Simon Marius [Source: Wikipedia] led Galileo to accuse Marius of plagiarism in his Il Saggiatore in 1623. Galileo strenuously insisted that Marius obtained his knowledge of the satellites from his (Galileo’s) book. Being by now the most famous astronomer in E ...
1: Properties of Pulsars
... radius of only 105 metres which is two orders of magnitude smaller than what is typical for white dwarfs. Only neutron stars were left as a possible explanation. Periods for radial oscillations of neutron stars were predicted to be larger than 1 second and were hence incompatible with the periods of ...
... radius of only 105 metres which is two orders of magnitude smaller than what is typical for white dwarfs. Only neutron stars were left as a possible explanation. Periods for radial oscillations of neutron stars were predicted to be larger than 1 second and were hence incompatible with the periods of ...
White Dwarf Stars - Stellar Physics Department
... And finally to complete the classification, a temperature index can follow their spectral classification. This index is defined as θ = 50400/Teff . Therefore, a white dwarf showing Balmer lines with an effective temperature of 20 000 K will be classified DA2.5. The temperature index is not always pr ...
... And finally to complete the classification, a temperature index can follow their spectral classification. This index is defined as θ = 50400/Teff . Therefore, a white dwarf showing Balmer lines with an effective temperature of 20 000 K will be classified DA2.5. The temperature index is not always pr ...
Terrestrial planet formation in exoplanetary systems with a giant
... even if the Eps. Eridani planet does not exist, our study might be taken as applying to a typical member of the category of extrasolar systems characterized by a distant low mass companion on a very eccentric orbit. Two different sets of simulations have been performed for each of the two extrasolar ...
... even if the Eps. Eridani planet does not exist, our study might be taken as applying to a typical member of the category of extrasolar systems characterized by a distant low mass companion on a very eccentric orbit. Two different sets of simulations have been performed for each of the two extrasolar ...
Astronomy: A Day-time Activity
... On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight. ...
... On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight. ...
The Magellan 20 Telescope Science Goals
... The baseline configuration is being developed with an upgrade path to a full multiconjugate adaptive optics (MCAO) system. This should allow diffraction-limited performance over ~1.6’ fields with high Strehl ratios. This mode may be best exploited with deployable IFUs or deployable high-resolution i ...
... The baseline configuration is being developed with an upgrade path to a full multiconjugate adaptive optics (MCAO) system. This should allow diffraction-limited performance over ~1.6’ fields with high Strehl ratios. This mode may be best exploited with deployable IFUs or deployable high-resolution i ...
Comparison of low- and high-mass star formation
... to competitive accretion. One may plausibly identify the dense filament in the early phase and the dense region at the bottom of the global gravitational potential well in the late phase as a McKee–Tan core (McKee & Tan 2003). However, the “cores” so identified are transient objects that are not in ...
... to competitive accretion. One may plausibly identify the dense filament in the early phase and the dense region at the bottom of the global gravitational potential well in the late phase as a McKee–Tan core (McKee & Tan 2003). However, the “cores” so identified are transient objects that are not in ...
The Deaths of Very Massive Stars
... units of 1000 km, of the mass shell in the presupernova star that encloses 2.5 M⊙ . The fiducial mass is taken to be well outside the iron core but deep enough in to sample the density structure around that core. It makes little difference whether this compactness is evaluated at the onset of hydrod ...
... units of 1000 km, of the mass shell in the presupernova star that encloses 2.5 M⊙ . The fiducial mass is taken to be well outside the iron core but deep enough in to sample the density structure around that core. It makes little difference whether this compactness is evaluated at the onset of hydrod ...
Determining the mass loss limit for close
... rXUV is the distance in the thermosphere where the optical thickness τXUV → 1 and the main part of the XUV radiation is absorbed. One should note that rXUV is close to the visual planetary radius and can therefore be substituted by rpl (Yelle 2004). Recently, Penz et al. (2008a) studied for the firs ...
... rXUV is the distance in the thermosphere where the optical thickness τXUV → 1 and the main part of the XUV radiation is absorbed. One should note that rXUV is close to the visual planetary radius and can therefore be substituted by rpl (Yelle 2004). Recently, Penz et al. (2008a) studied for the firs ...
WORD - Astrophysics
... could be achieved with a 100m-class telescope through deep Colour-Magnitude Diagrams for the inter-arm regions of disks, with an emphasis on the low surface brightness outer regions, out to the Virgo cluster. At even greater distances, identification of Blue Horizontal Branch stars in outer disks wo ...
... could be achieved with a 100m-class telescope through deep Colour-Magnitude Diagrams for the inter-arm regions of disks, with an emphasis on the low surface brightness outer regions, out to the Virgo cluster. At even greater distances, identification of Blue Horizontal Branch stars in outer disks wo ...
An analogy
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
Comet Catalina 2016 - Fraser Heights Chess Club
... • On Jan. 14, it will be less than a degree from Alkaid, the first star in the handle. This means that it’ll be easier for you to spot. • The great part is that from Jan. 8 to 10 — there will be a moonless night sky, and that means you have a great chance to see it. ...
... • On Jan. 14, it will be less than a degree from Alkaid, the first star in the handle. This means that it’ll be easier for you to spot. • The great part is that from Jan. 8 to 10 — there will be a moonless night sky, and that means you have a great chance to see it. ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.