![arXiv:0905.3008v1 [astro-ph.EP] 19 May 2009](http://s1.studyres.com/store/data/017089867_1-59d3a66da8f73e76d7a42b1bdf6b26f3-300x300.png)
arXiv:0905.3008v1 [astro-ph.EP] 19 May 2009
... In this paper, we considered the secular increase of astronomical unit recently reported by Krasinsky and Brumberg (2004), and suggested a possible explanation for this secular trend by means of the conservation law of total angular momentum. Assuming the existence of some tidal interactions that tr ...
... In this paper, we considered the secular increase of astronomical unit recently reported by Krasinsky and Brumberg (2004), and suggested a possible explanation for this secular trend by means of the conservation law of total angular momentum. Assuming the existence of some tidal interactions that tr ...
ASTR100 Class 01 - University of Maryland Department of
... How big is Earth compared to our solar system? Let’s reduce the size of the solar system by a factor of 10 billion; the Sun is now the size of a large grapefruit (14 cm ...
... How big is Earth compared to our solar system? Let’s reduce the size of the solar system by a factor of 10 billion; the Sun is now the size of a large grapefruit (14 cm ...
The Galaxy Presentation 2011
... - The motions of gas and stars in SgrA indicate that it contains a few million solar masses in a region no bigger than 3 lightyears. - Astronomers suspect SgrA is a black hole weighing 2.5 million solar masses; this is like no other observed black hole. - Other black hole candidates like Cygnus X-1 ...
... - The motions of gas and stars in SgrA indicate that it contains a few million solar masses in a region no bigger than 3 lightyears. - Astronomers suspect SgrA is a black hole weighing 2.5 million solar masses; this is like no other observed black hole. - Other black hole candidates like Cygnus X-1 ...
Slide 1
... • M > 4 M (Sun) – O and B stars • Burn H He via the more efficient CNO cycle • After H-core exhaustion the He-core contracts and heats up, but the H-burning continues around the He-core and the star puffs up • The star expands and cools, but the luminosity remains constant since the huge outer lay ...
... • M > 4 M (Sun) – O and B stars • Burn H He via the more efficient CNO cycle • After H-core exhaustion the He-core contracts and heats up, but the H-burning continues around the He-core and the star puffs up • The star expands and cools, but the luminosity remains constant since the huge outer lay ...
2. - Quia
... spacecraft is actually headed towards Sirius. If there is an intelligent civilization living on a planet near that star, how many years will it be until Voyager reaches it? 3. Do you think that it is possible that one of the Voyager spacecraft would ever be intercepted by a civilization around anoth ...
... spacecraft is actually headed towards Sirius. If there is an intelligent civilization living on a planet near that star, how many years will it be until Voyager reaches it? 3. Do you think that it is possible that one of the Voyager spacecraft would ever be intercepted by a civilization around anoth ...
ASTRONOMY 120
... As a dying star sheds its outer layers to make a planetary nebula, the dead core of the star is exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million tim ...
... As a dying star sheds its outer layers to make a planetary nebula, the dead core of the star is exposed. In the case of a solar-mass star, this core will be made of carbon. The core stabilizes at a radius roughly equal to that of the Earth. This means it has an incredibly high density, a million tim ...
Geosystems-7th-Edition-Christopherson-Solution
... • Distinguish among galaxies, stars, and planets, and locate Earth. 1. Describe the Sun’s status among stars in the Milky Way Galaxy. Describe the Sun’s location, size, and relationship to its planets. Our Sun is both unique to us and commonplace in our galaxy. It is only average in temperature, siz ...
... • Distinguish among galaxies, stars, and planets, and locate Earth. 1. Describe the Sun’s status among stars in the Milky Way Galaxy. Describe the Sun’s location, size, and relationship to its planets. Our Sun is both unique to us and commonplace in our galaxy. It is only average in temperature, siz ...
The Sun: Example of Radiation Laws
... Supernovae within a few thousand lt.-yrs. would be lethal to Earth life. Yet life could not exist without supernovae, because supernovae eject nearly all heavy elements into space. Until supernovae occurred, gas from which stars and planets were made contained virtually no elements heavier than heli ...
... Supernovae within a few thousand lt.-yrs. would be lethal to Earth life. Yet life could not exist without supernovae, because supernovae eject nearly all heavy elements into space. Until supernovae occurred, gas from which stars and planets were made contained virtually no elements heavier than heli ...
Powerpoint
... Pattern of absorption lines depends on temperature (mainly) and chemical composition. Spectra give most accurate info on these as well as: density in atmosphere gravity at surface velocity of star towards or from us ...
... Pattern of absorption lines depends on temperature (mainly) and chemical composition. Spectra give most accurate info on these as well as: density in atmosphere gravity at surface velocity of star towards or from us ...
October 2011
... dome and waited for it to get dark. It wasn’t long before the shutter was opened and we saw stars above the dome. What a wonderful sight. By about 7:30 we were observing. First we looked at Vega and then Epsilon Lyrae (the Double, Double) just to get an idea of what the seeing was like. On a scale o ...
... dome and waited for it to get dark. It wasn’t long before the shutter was opened and we saw stars above the dome. What a wonderful sight. By about 7:30 we were observing. First we looked at Vega and then Epsilon Lyrae (the Double, Double) just to get an idea of what the seeing was like. On a scale o ...
On the migration of a system of protoplanets
... Cochran & Mayor 1999): the 51 Peg-type planets. They all have masses of the order of MJup, and orbit their central stars very closely, having orbital periods of only a few days. As massive planets, according to standard theory, have formed at distances of ...
... Cochran & Mayor 1999): the 51 Peg-type planets. They all have masses of the order of MJup, and orbit their central stars very closely, having orbital periods of only a few days. As massive planets, according to standard theory, have formed at distances of ...
On the migration of a system of protoplanets
... Cochran & Mayor 1999): the 51 Peg-type planets. They all have masses of the order of MJup, and orbit their central stars very closely, having orbital periods of only a few days. As massive planets, according to standard theory, have formed at distances of ...
... Cochran & Mayor 1999): the 51 Peg-type planets. They all have masses of the order of MJup, and orbit their central stars very closely, having orbital periods of only a few days. As massive planets, according to standard theory, have formed at distances of ...
Grade 5 ELA Life on a New Planet
... size. They are all solid and made of rock. But there are also differences that keep Mercury, Venus, and Mars from being good places to live. Mercury is very close to the Sun, which makes it extremely hot. Regular temperatures can reach as high as 410 degrees! Mercury also does not have an atmosphere ...
... size. They are all solid and made of rock. But there are also differences that keep Mercury, Venus, and Mars from being good places to live. Mercury is very close to the Sun, which makes it extremely hot. Regular temperatures can reach as high as 410 degrees! Mercury also does not have an atmosphere ...
Mercury venus and jupiter in March 2014
... Many a times we see Bright Venus in day light as well. But hardly we have seen Jupiter in day Light. But since last week we been observing Jupiter in a day light just before Sun Sets. Best time to locate those planets in day Light is when they are close to the Moon, so we can focus in that location ...
... Many a times we see Bright Venus in day light as well. But hardly we have seen Jupiter in day Light. But since last week we been observing Jupiter in a day light just before Sun Sets. Best time to locate those planets in day Light is when they are close to the Moon, so we can focus in that location ...
E1 Introduction to the universe
... evidence that lots of ordinary matter does exist in these groupings. These can be thought of as low-mass failed stars or high-mass planets. They could even be black holes. These would produce little or no light. some fundamental particles (neutrinos) are known to exist in huge numbers. It is not kno ...
... evidence that lots of ordinary matter does exist in these groupings. These can be thought of as low-mass failed stars or high-mass planets. They could even be black holes. These would produce little or no light. some fundamental particles (neutrinos) are known to exist in huge numbers. It is not kno ...
Luminosity - UCF Physics
... What the “computers” did was sift through literally 100’s of thousands of stellar spectra. Established a classification scheme based on Hydrogen lines…. The types were alphabetical….letters were assigned in declining strength of the H-lines ...
... What the “computers” did was sift through literally 100’s of thousands of stellar spectra. Established a classification scheme based on Hydrogen lines…. The types were alphabetical….letters were assigned in declining strength of the H-lines ...
Secular Increase of the Astronomical Unit: a Possible Explanation in
... of astronomical units, e.g., Huang et al. (1995); Standish (2005); Klioner (2008); Capitaine and Guinot (2009). By using equations (1) and (24), we obtain GMSun in SI units, and so far GMSun is conventionally regarded as being a “fixed value” in SI units. However, the discussions in Noerdlinger (200 ...
... of astronomical units, e.g., Huang et al. (1995); Standish (2005); Klioner (2008); Capitaine and Guinot (2009). By using equations (1) and (24), we obtain GMSun in SI units, and so far GMSun is conventionally regarded as being a “fixed value” in SI units. However, the discussions in Noerdlinger (200 ...
27.1: Characteristics of Stars
... The greater the mass of the star, the shorter its lifetime Low mass stars with an original mass of less than 8 times the sun (8 solar masses) will become Planetary Nebula. The remnant state of these stars is a white dwarf. High mass stars containing more than 8 solar masses will explode violently as ...
... The greater the mass of the star, the shorter its lifetime Low mass stars with an original mass of less than 8 times the sun (8 solar masses) will become Planetary Nebula. The remnant state of these stars is a white dwarf. High mass stars containing more than 8 solar masses will explode violently as ...
Sample multiple choice questions for Exam 2
... 1. Most of the bright stars in the sky are bright because they are close (within 10 light years) to our Sun. a) correct b) wrong: Most are intrinsically bright and lie far from the Sun. c) wrong: Close means closer than 1 parsec. d) wrong: This is true only for green stars. e) wrong: Both changes c) ...
... 1. Most of the bright stars in the sky are bright because they are close (within 10 light years) to our Sun. a) correct b) wrong: Most are intrinsically bright and lie far from the Sun. c) wrong: Close means closer than 1 parsec. d) wrong: This is true only for green stars. e) wrong: Both changes c) ...
File
... • Recurring novae occur in binary systems. The dwarf’s gravitational field pulls matter (hydrogen & helium) from the surface of a main sequence or giant companion star. The stolen gas builds up on the surface of the white dwarf and becomes hotter & denser, eventually reaching a high enough tempera ...
... • Recurring novae occur in binary systems. The dwarf’s gravitational field pulls matter (hydrogen & helium) from the surface of a main sequence or giant companion star. The stolen gas builds up on the surface of the white dwarf and becomes hotter & denser, eventually reaching a high enough tempera ...
Stars
... In a star like the Sun, electron degeneracy stops the contraction of the core before the temperature gets high enough to start carbon burning. Supported against further contraction, the core cannot get any more energy by gravitational contraction. From this point on, the core cools down like an ordi ...
... In a star like the Sun, electron degeneracy stops the contraction of the core before the temperature gets high enough to start carbon burning. Supported against further contraction, the core cannot get any more energy by gravitational contraction. From this point on, the core cools down like an ordi ...
Stages - A Summary - University of Dayton
... dwarfs) will be dim and cool and, as they grow older, will only grow dimmer and cooler, ultimately becoming black dwarfs (see STAGE 14). Astronomers have identified several brown dwarf candidates, and even have evidence for the presence of Jupiter-like planets in orbit around several nearby stars. R ...
... dwarfs) will be dim and cool and, as they grow older, will only grow dimmer and cooler, ultimately becoming black dwarfs (see STAGE 14). Astronomers have identified several brown dwarf candidates, and even have evidence for the presence of Jupiter-like planets in orbit around several nearby stars. R ...
ASTR 340 - TerpConnect
... force, binds neutrons and protons together to form a compact body, the nucleus, with size about 10-15 m. The protons are positively charged while the neutron has not charged. Thus, the nucleus is positively charged. Electrons are attracted to the nucleus and circle around it in a fashion similar to ...
... force, binds neutrons and protons together to form a compact body, the nucleus, with size about 10-15 m. The protons are positively charged while the neutron has not charged. Thus, the nucleus is positively charged. Electrons are attracted to the nucleus and circle around it in a fashion similar to ...
WASP-24b: A New Transiting Close-in Hot Jupiter
... Large scale, ground-based surveys for transiting planets are yielding a surprisingly diverse set of close-in giant planets. The last few years have seen the discovery of a number of so-called ‘bloated’ close-in Jovian planets, for example WASP-17 b (Anderson et al. 2010) and Kepler-7 b (Latham et al ...
... Large scale, ground-based surveys for transiting planets are yielding a surprisingly diverse set of close-in giant planets. The last few years have seen the discovery of a number of so-called ‘bloated’ close-in Jovian planets, for example WASP-17 b (Anderson et al. 2010) and Kepler-7 b (Latham et al ...
the southern astronomer
... The other inner planet, Venus is visible in the predawn sky. At the beginning of the month, the planet is showing a half phase (dichotomy) – by the end its phase will be 62%. The planet will be decreasing in angular size as it also heads for superior conjunction in the early part of 2018, when it on ...
... The other inner planet, Venus is visible in the predawn sky. At the beginning of the month, the planet is showing a half phase (dichotomy) – by the end its phase will be 62%. The planet will be decreasing in angular size as it also heads for superior conjunction in the early part of 2018, when it on ...
Planetary habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body, a theoretical process known as panspermia. As the existence of life beyond Earth is unknown, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favourable to life's flourishing—in particular those factors that have sustained complex, multicellular organisms and not just simpler, unicellular creatures. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology.An absolute requirement for life is an energy source, and the notion of planetary habitability implies that many other geophysical, geochemical, and astrophysical criteria must be met before an astronomical body can support life. In its astrobiology roadmap, NASA has defined the principal habitability criteria as ""extended regions of liquid water, conditions favourable for the assembly of complex organic molecules, and energy sources to sustain metabolism.""In determining the habitability potential of a body, studies focus on its bulk composition, orbital properties, atmosphere, and potential chemical interactions. Stellar characteristics of importance include mass and luminosity, stable variability, and high metallicity. Rocky, terrestrial-type planets and moons with the potential for Earth-like chemistry are a primary focus of astrobiological research, although more speculative habitability theories occasionally examine alternative biochemistries and other types of astronomical bodies.The idea that planets beyond Earth might host life is an ancient one, though historically it was framed by philosophy as much as physical science. The late 20th century saw two breakthroughs in the field. The observation and robotic spacecraft exploration of other planets and moons within the Solar System has provided critical information on defining habitability criteria and allowed for substantial geophysical comparisons between the Earth and other bodies. The discovery of extrasolar planets, beginning in the early 1990s and accelerating thereafter, has provided further information for the study of possible extraterrestrial life. These findings confirm that the Sun is not unique among stars in hosting planets and expands the habitability research horizon beyond the Solar System.The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only 10–17 million years old. According to the panspermia hypothesis, microscopic life—distributed by meteoroids, asteroids and other small Solar System bodies—may exist throughout the universe. Nonetheless, Earth is the only place in the universe known to harbor life. Estimates of habitable zones around other stars, along with the discovery of hundreds of extrasolar planets and new insights into the extreme habitats here on Earth, suggest that there may be many more habitable places in the universe than considered possible until very recently. On 4 November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs within the Milky Way. 11 billion of these estimated planets may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists.