1 Distance: A History of Parallax and Brief Introduction to Standard
... not born with ability of depth perception—it is something the brain adapts to over time. Often one notices an infant in waving their hands about wildly believing they can reach the objects on an out-of-reach mobile suspended above their crib. These “lessons” will help the infant acquire depth percep ...
... not born with ability of depth perception—it is something the brain adapts to over time. Often one notices an infant in waving their hands about wildly believing they can reach the objects on an out-of-reach mobile suspended above their crib. These “lessons” will help the infant acquire depth percep ...
Riccioli Measures the Stars: Observations of the
... space, or less, to as much as two minutes. The telescope was not then invented which shows that this is an optical delusion, and that they are points of immeasurably small diameter. It was certain to Tycho Brahe, that if the earth did move, the whole motion of the earth in its orbit did not alter th ...
... space, or less, to as much as two minutes. The telescope was not then invented which shows that this is an optical delusion, and that they are points of immeasurably small diameter. It was certain to Tycho Brahe, that if the earth did move, the whole motion of the earth in its orbit did not alter th ...
The Clouds
... beacons in a steady-state Universe. They could have come into existence in the early Universe, or simply built up through collisions and coagulation of clouds of atoms. Although normal stars like our Sun consist of atoms and the gas from which they originate was also atomic, stars are born in molecu ...
... beacons in a steady-state Universe. They could have come into existence in the early Universe, or simply built up through collisions and coagulation of clouds of atoms. Although normal stars like our Sun consist of atoms and the gas from which they originate was also atomic, stars are born in molecu ...
Published in Contemp. Phys. 51, 464-465 (2010).
... Timbuktu, in Mali) acquired such an extraordinarily detailed knowledge of Sirius. They are even aware of its companion, which they say is made of a metal so dense that all earthly beings combined could not lift it, and they are aware of the orbital period of the Sirius components being ∼50 years. Cu ...
... Timbuktu, in Mali) acquired such an extraordinarily detailed knowledge of Sirius. They are even aware of its companion, which they say is made of a metal so dense that all earthly beings combined could not lift it, and they are aware of the orbital period of the Sirius components being ∼50 years. Cu ...
Essential physics of early galaxy formation
... their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficiency such that the energy produced by newly-formed stars is sufficient to expel all the remaining gas, quenching fur ...
... their DM potential well can sustain much larger star formation rates (SFR) without losing gas. This naturally implies that, at any given time, there is a limiting star formation efficiency such that the energy produced by newly-formed stars is sufficient to expel all the remaining gas, quenching fur ...
Autumn 2016 Midterm Review - Autumn 2015 Questions
... b. causing the charged particles to fuse and generate energy similar to the Sun. c. wraps charged particles around the Earth’s equator, generating heat at the poles. d. which is reflected back towards the Sun, drawing energy from Earth’s atmosphere. ...
... b. causing the charged particles to fuse and generate energy similar to the Sun. c. wraps charged particles around the Earth’s equator, generating heat at the poles. d. which is reflected back towards the Sun, drawing energy from Earth’s atmosphere. ...
All About Elements
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
Helium - Boreal Science
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
... in the universe. Only Hydrogen is more abundant! These two elements were copiously formed during the creation of the universe. In the early stages of the universe, helium and hydrogen nuclei were actually formed. No atoms were formed until about 300,000 years after the Big Bang took place, when the ...
September - Rose City Astronomers
... home, and I’ve had a blast with it. The little scope is so portable that it requires almost no thought for setting it up – it stays assembled to its mount – so all I have to do is find a chair and a decent place to plunk it down. ...
... home, and I’ve had a blast with it. The little scope is so portable that it requires almost no thought for setting it up – it stays assembled to its mount – so all I have to do is find a chair and a decent place to plunk it down. ...
19_Testbank - Lick Observatory
... C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk today. Answer: B 33) Which of the following statements about globular clusters is false? A) Globular clusters contain many thou ...
... C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk today. Answer: B 33) Which of the following statements about globular clusters is false? A) Globular clusters contain many thou ...
Neutron Stars
... Finally, in 1987, the first supernova observed that year, in the close-by irregular galaxy known as the Large Magellanic Cloud, produced a brief neutrino pulse observed by at least two neutrino observatories, the IMB detector in the Morton Salt Mine near Cleveland, and the Kamiokande detector in the ...
... Finally, in 1987, the first supernova observed that year, in the close-by irregular galaxy known as the Large Magellanic Cloud, produced a brief neutrino pulse observed by at least two neutrino observatories, the IMB detector in the Morton Salt Mine near Cleveland, and the Kamiokande detector in the ...
Early-type stars in the core of the young open cluster Westerlund 2
... λ 4686 absorption accompanied by weak N λλ 4634-40 emission, which leads to an ((f)) classification. The earliest star in our sample is MSP 183 which displays prominent N λλ 4604, 4620 absorption lines. Except for the weaker N λλ 4634-4640 lines, the spectrum of MSP 183 very much resembles ...
... λ 4686 absorption accompanied by weak N λλ 4634-40 emission, which leads to an ((f)) classification. The earliest star in our sample is MSP 183 which displays prominent N λλ 4604, 4620 absorption lines. Except for the weaker N λλ 4634-4640 lines, the spectrum of MSP 183 very much resembles ...
It is now recognized that the vast majority of ellipticals are of
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
Planetesimal collisions in binary systems
... The maximum size that can be reached in this scenario is limited by the total amount of solid material present in the disc. In the 2D approximation, this mass has to be artificially low in order to end up with a realistic collision time scale. For a disc that has twice the solid material, keeping al ...
... The maximum size that can be reached in this scenario is limited by the total amount of solid material present in the disc. In the 2D approximation, this mass has to be artificially low in order to end up with a realistic collision time scale. For a disc that has twice the solid material, keeping al ...
404.06 Stephen Drake
... Future Directions and Questions About DG CVn • Complete a full X-ray and optical analysis to infer geometry and physical properties of flaring plasma (Kowalski et al. 2014) • Continued Swift monitoring to build up flare vs energy statistics might be useful: suspect this star must have frequent smal ...
... Future Directions and Questions About DG CVn • Complete a full X-ray and optical analysis to infer geometry and physical properties of flaring plasma (Kowalski et al. 2014) • Continued Swift monitoring to build up flare vs energy statistics might be useful: suspect this star must have frequent smal ...
1. The catalogue structure
... given star in the Almagest. This numeration was devised by the astronomer Bailey. Surviving manuscripts of the Almagest contain no numerical indexation. Bailey was a famous commentator and researcher of the Almagest. According to Bailey, the sum total of stars listed in the Almagest equals 1028. The ...
... given star in the Almagest. This numeration was devised by the astronomer Bailey. Surviving manuscripts of the Almagest contain no numerical indexation. Bailey was a famous commentator and researcher of the Almagest. According to Bailey, the sum total of stars listed in the Almagest equals 1028. The ...
IR Universe
... IRAS found that dust from comets fills the Solar System and that comets are dustier than they were thought to be. Many of the meteors may be the larger pieces of this comet dust. IRAS discovered 6 new comets including comet IRAS-Araki-Alcock and collected infrared data on 25 previously known comet ...
... IRAS found that dust from comets fills the Solar System and that comets are dustier than they were thought to be. Many of the meteors may be the larger pieces of this comet dust. IRAS discovered 6 new comets including comet IRAS-Araki-Alcock and collected infrared data on 25 previously known comet ...
The Extragalactic Group of MPE and USM
... • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S sub-sample) • FORS Deep Field (IAB=26.8): 98% of all galaxies with dz/(1+z)<0.03; GOODS S (KAB=25.4): dz/(1+z)<0.055 • Deep I-selection misses only a small fraction of deep K sele ...
... • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S sub-sample) • FORS Deep Field (IAB=26.8): 98% of all galaxies with dz/(1+z)<0.03; GOODS S (KAB=25.4): dz/(1+z)<0.055 • Deep I-selection misses only a small fraction of deep K sele ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.