ppt - Astronomy & Physics
... these stars from spectral lines. Their classes – A, B, C, D, etc, were mostly based on temperature and hydrogen lines ...
... these stars from spectral lines. Their classes – A, B, C, D, etc, were mostly based on temperature and hydrogen lines ...
Unit 3 - Section 9.2 2011 Star Characteristics0
... 2. There is also a spectral pattern for the Sun. What is the elemental composition of the Sun? 3. There are three “mystery stars.” Using a ruler, line up the spectral patterns of the elements to the mystery stars. 4. Answer the following questions. a. In which two mystery stars is calcium present? b ...
... 2. There is also a spectral pattern for the Sun. What is the elemental composition of the Sun? 3. There are three “mystery stars.” Using a ruler, line up the spectral patterns of the elements to the mystery stars. 4. Answer the following questions. a. In which two mystery stars is calcium present? b ...
Physics of Astronomy – Week 3 quiz
... space probes, but do not hold for objects orbiting any other object in the universe. apply only to large planets orbiting our Sun, but provide only an approximate description for smaller objects, such as asteroids, etc. and are not applicable at all for other situations such as mutually orbiting bin ...
... space probes, but do not hold for objects orbiting any other object in the universe. apply only to large planets orbiting our Sun, but provide only an approximate description for smaller objects, such as asteroids, etc. and are not applicable at all for other situations such as mutually orbiting bin ...
Presentation: The Sun and Solar Nebula Theory
... • It is approximately 8 light minutes away. (1.5x108 km, or nearly 93 million miles) (Always use caution when viewing the Sun. Never use unfiltered telescopes, binoculars or cameras to observe the Sun!) ...
... • It is approximately 8 light minutes away. (1.5x108 km, or nearly 93 million miles) (Always use caution when viewing the Sun. Never use unfiltered telescopes, binoculars or cameras to observe the Sun!) ...
Passport to the Universe Educator`s Guide Text
... the Earth and the other planets in the larger scheme of things. From out here, the sizes of and distances between the Earth, Sun, and other planets appear relatively small. On our trip, we pass three of the eight planets—Mars, Jupiter (and its moons, Io and Europa), and Saturn. We now head out for ...
... the Earth and the other planets in the larger scheme of things. From out here, the sizes of and distances between the Earth, Sun, and other planets appear relatively small. On our trip, we pass three of the eight planets—Mars, Jupiter (and its moons, Io and Europa), and Saturn. We now head out for ...
The Interstellar Medium and Star Formation
... tenuous gas of mostly Hydrogen [H] (74% of the mass) and Helium [He] (24% of the mass) mixed together. This is similar to the composition of the Sun. • The heavier elements make up just 2% of the mass of the interstellar medium, including elements in small dust grains, mixed together with the H and ...
... tenuous gas of mostly Hydrogen [H] (74% of the mass) and Helium [He] (24% of the mass) mixed together. This is similar to the composition of the Sun. • The heavier elements make up just 2% of the mass of the interstellar medium, including elements in small dust grains, mixed together with the H and ...
Document
... Why larger semi-major axes now? Kepler’s third law implies longer period, so requires monitoring for many years to determine ‘wobble’ precisely Amplitude of wobble smaller (at fixed mP ); benefit of improved spectroscopic precision ...
... Why larger semi-major axes now? Kepler’s third law implies longer period, so requires monitoring for many years to determine ‘wobble’ precisely Amplitude of wobble smaller (at fixed mP ); benefit of improved spectroscopic precision ...
ASTRONOMY 0089: EXAM 1 Class Meets M,W,F, 1:00 PM Feb 12
... 15. Suppose the angular diameter of an object at a distance of 1 light year is 6 arcseconds. At a distance of 2 light years its angular diameter would be a. 6 arcseconds b. 24 arcseconds c. 12 arcseconds d. 3 arcseconds e. 1.5arcseconds 16. An emission line occurs in a spectrum when a. there is a c ...
... 15. Suppose the angular diameter of an object at a distance of 1 light year is 6 arcseconds. At a distance of 2 light years its angular diameter would be a. 6 arcseconds b. 24 arcseconds c. 12 arcseconds d. 3 arcseconds e. 1.5arcseconds 16. An emission line occurs in a spectrum when a. there is a c ...
Last Year`s Exam, Section B
... when applied to extrasolar planetary systems. What factors enter into estimates of the number of technological civilisations in the Galaxy? Briefly discuss whether it is possible to make accurate estimates of the values of these factors. ...
... when applied to extrasolar planetary systems. What factors enter into estimates of the number of technological civilisations in the Galaxy? Briefly discuss whether it is possible to make accurate estimates of the values of these factors. ...
Can we expect to find “Our Air” anywhere else in the Universe?
... • Kepler has a much higher probability of detecting Earthlike planets than the Hubble Space Telescope, since it has a much larger field of view. • Of the approximately half million stars in Kepler's field of view, around 150,000 stars were selected and are observed simultaneously, measuring variatio ...
... • Kepler has a much higher probability of detecting Earthlike planets than the Hubble Space Telescope, since it has a much larger field of view. • Of the approximately half million stars in Kepler's field of view, around 150,000 stars were selected and are observed simultaneously, measuring variatio ...
Life and Earth: Philosophical Remedy for Environmental Problems
... ONDITIONS for life to exist in the universe are limited, but gradual progress is being made by surveying the existence of extra-solarplanets. For example, the habitable zone for life in any galaxy is thought to be a conditional planet system which is ~25,000 light years or more away from the center ...
... ONDITIONS for life to exist in the universe are limited, but gradual progress is being made by surveying the existence of extra-solarplanets. For example, the habitable zone for life in any galaxy is thought to be a conditional planet system which is ~25,000 light years or more away from the center ...
Transit surveys for Earths in the habitable zones of white dwarfs
... luminosity and effective temperature, Teff , versus age from white dwarf cooling tracks (Bergeron et al. 2001). With the luminosity and effective temperature, I compute the range of distances within which an Earth-like planet could have liquid water on the surface if it were placed there with an int ...
... luminosity and effective temperature, Teff , versus age from white dwarf cooling tracks (Bergeron et al. 2001). With the luminosity and effective temperature, I compute the range of distances within which an Earth-like planet could have liquid water on the surface if it were placed there with an int ...
PDF, 179Kb - Maths Careers
... The brightest star in the Scorpio constellation is a red supergiant star called Antares. Even though Antares and our solar system are both in the Milky Way galaxy, Antares is 4.94 x 1015 km away from the Earth. Astronomers estimate that Antares is just one of roughly 2.5 x 1011 stars in the Milky Wa ...
... The brightest star in the Scorpio constellation is a red supergiant star called Antares. Even though Antares and our solar system are both in the Milky Way galaxy, Antares is 4.94 x 1015 km away from the Earth. Astronomers estimate that Antares is just one of roughly 2.5 x 1011 stars in the Milky Wa ...
The Distribution of Stars Most Likely to Harbor Intelligent Life
... intelligent life must evolve before the end of the life of the star, the phase space below this curve is excluded. The solar system data is indicated by the ⊕ symbol. The theoretical distribution φi (Ti ) is unknown, but realizable Ti ’s must be less than the age of the Galaxy, Log(Tgal ) = 0. We n ...
... intelligent life must evolve before the end of the life of the star, the phase space below this curve is excluded. The solar system data is indicated by the ⊕ symbol. The theoretical distribution φi (Ti ) is unknown, but realizable Ti ’s must be less than the age of the Galaxy, Log(Tgal ) = 0. We n ...
Origin of Modern Astronomy
... 1. The path of each planet around the sun is an ellipse, with the sun at one focus. The other focus is symmetrically located at the opposite end of the ellipse. 2. Each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in equal time intervals. If a planet is ...
... 1. The path of each planet around the sun is an ellipse, with the sun at one focus. The other focus is symmetrically located at the opposite end of the ellipse. 2. Each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in equal time intervals. If a planet is ...
Radio Detection of Extrasolar Planets:
... In last decade, exciting discovery of extrasolar planets n ~ 100 planetary systems n Indirect detection via optical signature from host star Detecting fi characterizing: n What are their properties? n Can we detect planets at other wavelengths? n Implications for habitability of planets to be discov ...
... In last decade, exciting discovery of extrasolar planets n ~ 100 planetary systems n Indirect detection via optical signature from host star Detecting fi characterizing: n What are their properties? n Can we detect planets at other wavelengths? n Implications for habitability of planets to be discov ...
pluto: a human comedy
... place from which they were observed. These facts could be organised into a workable model, if one imagined a round Earth which rotated with a period of one day, about an axis which pointed in a direction very close to the position of the Polaris. This model is, of course, consistent with the notion ...
... place from which they were observed. These facts could be organised into a workable model, if one imagined a round Earth which rotated with a period of one day, about an axis which pointed in a direction very close to the position of the Polaris. This model is, of course, consistent with the notion ...
Lecture 5: Planetary system formation theories o Topics to be covered:
... hyperbolic orbit, (b) As it collapses, it deforms into an egg shape, (c) The whole protostar is stretched into an arc shaped filament of material at perihelion, (d) As the filament leaves perihelion it straightens up, (e) The filament fragments to produce several protoplanetary condensations, (f) In ...
... hyperbolic orbit, (b) As it collapses, it deforms into an egg shape, (c) The whole protostar is stretched into an arc shaped filament of material at perihelion, (d) As the filament leaves perihelion it straightens up, (e) The filament fragments to produce several protoplanetary condensations, (f) In ...
The Sun is a mass of Incandescent Gas
... The Sun and other stars are really only roughly in equilibrium. The Sun is extremely dynamic, and has storms larger than the Earth. ...
... The Sun and other stars are really only roughly in equilibrium. The Sun is extremely dynamic, and has storms larger than the Earth. ...
The Reflector - Peterborough Astronomical Association
... But these discoveries were made by inferred evidence. One such method is to measure the orbit of the star to detect any wobble that may be caused by the gravitational tug of a nearby planet. Another technique measures the magnitude of the star searching for small repeated dips in its brightness that ...
... But these discoveries were made by inferred evidence. One such method is to measure the orbit of the star to detect any wobble that may be caused by the gravitational tug of a nearby planet. Another technique measures the magnitude of the star searching for small repeated dips in its brightness that ...
Orbits and Applications
... We define escape velocity as the minimum speed needed to escape a gravitational field (usually from the surface). Escaping means being able to reach r = ∞. We found this is possible if we have a total energy ≥ 0. Total energy of 0 means ...
... We define escape velocity as the minimum speed needed to escape a gravitational field (usually from the surface). Escaping means being able to reach r = ∞. We found this is possible if we have a total energy ≥ 0. Total energy of 0 means ...
Nuclear Interactions in Supernovae .
... • The hydrogen is burned in a runaway reaction, and an enormous amount of energy is released from all the hydrogen being fused in a short amount of time. • This causes an explosion on the surface of the dwarf, which doesn’t affect the star, but increases its brightness by 50,000 to 100,000 times tha ...
... • The hydrogen is burned in a runaway reaction, and an enormous amount of energy is released from all the hydrogen being fused in a short amount of time. • This causes an explosion on the surface of the dwarf, which doesn’t affect the star, but increases its brightness by 50,000 to 100,000 times tha ...
Lecture 19 Review
... to make a heavier element. At this point gravitational collapse occurs followed by a catastrophic rebound. A fast neutron process produces heavy elements all the way up to Plutonium. There is a strong neutron burst and a supernova explosion. For a few days the supernova has a luminosity L = 10 billi ...
... to make a heavier element. At this point gravitational collapse occurs followed by a catastrophic rebound. A fast neutron process produces heavy elements all the way up to Plutonium. There is a strong neutron burst and a supernova explosion. For a few days the supernova has a luminosity L = 10 billi ...
Unit 1 - UW Madison Astronomy Department
... a. There are different names for the same thing b. Brightness is how we see a star, luminosity is how much light it emits c. Luminosity is the measure of the size of the star, brightness is the measure the age the star d. None of the above ...
... a. There are different names for the same thing b. Brightness is how we see a star, luminosity is how much light it emits c. Luminosity is the measure of the size of the star, brightness is the measure the age the star d. None of the above ...
Our Sun, Sol - Hobbs High School
... • It continues to collapse into a white dwarf star, which is extremely hot and dense. • Our sun’s core will collapse into a white dwarf about twice the size of Earth with a gravity about a million times that of Earth. • This is expected to happen in about 5 billion years, so don’t panic! Sorry, our ...
... • It continues to collapse into a white dwarf star, which is extremely hot and dense. • Our sun’s core will collapse into a white dwarf about twice the size of Earth with a gravity about a million times that of Earth. • This is expected to happen in about 5 billion years, so don’t panic! Sorry, our ...
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.