Chapter 1: Our Place in the Universe
... • All galaxies outside our Local Group are moving away from us. • The more distant the galaxy, the faster it is racing away. Conclusion: We live in an expanding universe. ...
... • All galaxies outside our Local Group are moving away from us. • The more distant the galaxy, the faster it is racing away. Conclusion: We live in an expanding universe. ...
Constraints on a Chance Universe & The Anthropic Principle
... The initial assumptions made for the terms in this equation (whose values, except for N*, were very poorly known) were exceedingly optimistic. For example, Carl Sagan assumed that ALL stars had 10 planets. The results of these assumptions were an estimate of perhaps one million civilizations of cre ...
... The initial assumptions made for the terms in this equation (whose values, except for N*, were very poorly known) were exceedingly optimistic. For example, Carl Sagan assumed that ALL stars had 10 planets. The results of these assumptions were an estimate of perhaps one million civilizations of cre ...
Galaxies - cloudfront.net
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
Chapter 15 The Formation of Planetary Systems
... However many multi-planet systems are now known, and one system has two planets that resemble Jupiter and Saturn. (See earlier slide with a Jupiter-like orbit for reminder of why it takes so long to find these planets.) ! Selection effect biases sample toward massive planets ...
... However many multi-planet systems are now known, and one system has two planets that resemble Jupiter and Saturn. (See earlier slide with a Jupiter-like orbit for reminder of why it takes so long to find these planets.) ! Selection effect biases sample toward massive planets ...
Chapter 15 The Formation of Planetary Systems
... However many multi-planet systems are now known, and one system has two planets that resemble Jupiter and Saturn. (See earlier slide with a Jupiter-like orbit for reminder of why it takes so long to find these planets.) Selection effect biases sample toward massive planets ...
... However many multi-planet systems are now known, and one system has two planets that resemble Jupiter and Saturn. (See earlier slide with a Jupiter-like orbit for reminder of why it takes so long to find these planets.) Selection effect biases sample toward massive planets ...
Word version of Episode 704
... Way. It is about 2.2 million light years away and about 100 000 light years across. You will probably only see the central bright region, which is about a quarter of this distance across. It looks like a faint misty globule of light with very hazy edges. To make sure of seeing M31, use binoculars. T ...
... Way. It is about 2.2 million light years away and about 100 000 light years across. You will probably only see the central bright region, which is about a quarter of this distance across. It looks like a faint misty globule of light with very hazy edges. To make sure of seeing M31, use binoculars. T ...
3.1 Radio Astronomy Research Results For much of PY 2010, radio
... PALFA to determine the masses and to test the orbital period decay against GR to reasonably high precision. Pulsars have long been known to be intermittent through the appearance of bursts of pulses, pulse nulling and other modulations. Recent work has only underscored intermittency, including the d ...
... PALFA to determine the masses and to test the orbital period decay against GR to reasonably high precision. Pulsars have long been known to be intermittent through the appearance of bursts of pulses, pulse nulling and other modulations. Recent work has only underscored intermittency, including the d ...
Staring Back to Cosmic Dawn - UC-HiPACC
... expansion was decelerating until about 5 billion years ago. But measurements of Type Ia supernovae convinced astronomers in 1998 that cosmic expansion has been accelerating ever since, research that led to the 2011 Nobel Prize in physics. Astronomers hope that studying Type Ia supernovae identified ...
... expansion was decelerating until about 5 billion years ago. But measurements of Type Ia supernovae convinced astronomers in 1998 that cosmic expansion has been accelerating ever since, research that led to the 2011 Nobel Prize in physics. Astronomers hope that studying Type Ia supernovae identified ...
Kepler Mission Workshop Presentation
... • Kepler Mission is optimized for finding habitable planets ( 0.5 to 10 MÅ ) in the HZ ( near 1 AU ) of solar-like stars • Continuously and simultaneously monitor 100,000 main-sequence stars • Use a one-meter Schmidt telescope: FOV >100 deg2 with an array of 42 CCD • Photometric precision: Noise < 2 ...
... • Kepler Mission is optimized for finding habitable planets ( 0.5 to 10 MÅ ) in the HZ ( near 1 AU ) of solar-like stars • Continuously and simultaneously monitor 100,000 main-sequence stars • Use a one-meter Schmidt telescope: FOV >100 deg2 with an array of 42 CCD • Photometric precision: Noise < 2 ...
Galaxies - science9atsouthcarletonhs
... graceful shapes of arms emanating from a bright central nucleus. Spirals are classified according to how tightly or loosely wound the arms are, and it turns out that the brightness of the central nucleus is correlated to the tightness of the arm. The galaxies M 104 (below) and M 51 (right) respectiv ...
... graceful shapes of arms emanating from a bright central nucleus. Spirals are classified according to how tightly or loosely wound the arms are, and it turns out that the brightness of the central nucleus is correlated to the tightness of the arm. The galaxies M 104 (below) and M 51 (right) respectiv ...
Twitter Feed ITSO Symposium 2017
... The interstellar medium (ISM) metallicity provide a powerful constrain on the complex interplay of star formation and the galactic inflow/outflow, in understanding the factors affecting galaxy evolution. Disentangling the effect of internal (stellar mass) and external (environment) processes on the ...
... The interstellar medium (ISM) metallicity provide a powerful constrain on the complex interplay of star formation and the galactic inflow/outflow, in understanding the factors affecting galaxy evolution. Disentangling the effect of internal (stellar mass) and external (environment) processes on the ...
Ramin A. Skibba - Southern California Center for Galaxy Evolution
... Galaxy formation models typically assume that the central galaxy in a halo is the most massive and most luminous galaxy, and that the central galaxy is at rest at the center of the dark matter halo. Both of these assumptions are false. The observed velocity and spatial offsets of brightest halo gala ...
... Galaxy formation models typically assume that the central galaxy in a halo is the most massive and most luminous galaxy, and that the central galaxy is at rest at the center of the dark matter halo. Both of these assumptions are false. The observed velocity and spatial offsets of brightest halo gala ...
151 - ESO
... she do? She started filling her eyes with tears. When Perseus persisted, questioning her again and again, she became afraid lest her unwillingness to talk might seem due to guilt. So she told him the name of her country, and her own name, and she also told him how her mother, a beautiful woman, had ...
... she do? She started filling her eyes with tears. When Perseus persisted, questioning her again and again, she became afraid lest her unwillingness to talk might seem due to guilt. So she told him the name of her country, and her own name, and she also told him how her mother, a beautiful woman, had ...
Additional Cosmology Images
... A recent survey of stars conducted with the Spitzer Space Telescope is convincing astronomers that the Milky Way is not just an ordinary spiral galaxy. Looking out from within the Galaxy's disk, the true structure of the Milky Way is difficult to discern. However, the penetrating infrared census of ...
... A recent survey of stars conducted with the Spitzer Space Telescope is convincing astronomers that the Milky Way is not just an ordinary spiral galaxy. Looking out from within the Galaxy's disk, the true structure of the Milky Way is difficult to discern. However, the penetrating infrared census of ...
The Age Distribution of Potential Intelligent Life in the Milky Way
... has no doubt been pondered by countless people over the centuries. The sheer size of the universe leads many to conclude that, “no, we are not alone”. However, with no obvious evidence of other civilisations’ existence, this reality seems difficult to accept. Therefore, at present this question shou ...
... has no doubt been pondered by countless people over the centuries. The sheer size of the universe leads many to conclude that, “no, we are not alone”. However, with no obvious evidence of other civilisations’ existence, this reality seems difficult to accept. Therefore, at present this question shou ...
document
... The second advance, the theory of natural selection, suggested an answer. According to this proposal, set forth by Charles Darwin and Alfred Russel Wallace, some of the differences between individuals in a population are heritable. When the environment changes, individuals bearing traits that provid ...
... The second advance, the theory of natural selection, suggested an answer. According to this proposal, set forth by Charles Darwin and Alfred Russel Wallace, some of the differences between individuals in a population are heritable. When the environment changes, individuals bearing traits that provid ...
Astonomy-Space The Final Frontier
... Show how the relative motions of the Earth, the Sun and the Moon lead to eclipses. Describe how some ancient civilizations attempted to explain the heavens in terms of Earth-centered models of the universe. Summarize the role of Renaissance science in the history of astronomy. Explain how th ...
... Show how the relative motions of the Earth, the Sun and the Moon lead to eclipses. Describe how some ancient civilizations attempted to explain the heavens in terms of Earth-centered models of the universe. Summarize the role of Renaissance science in the history of astronomy. Explain how th ...
ch19
... the galactic center rapidly (shown by the red arrows) and is compressed as it passes through the slow-moving spiral arms (whose motion is shown by the blue arrows). This compression triggers star formation in the interstellar matter, so that new stars appear on the “downstream” side of the densest p ...
... the galactic center rapidly (shown by the red arrows) and is compressed as it passes through the slow-moving spiral arms (whose motion is shown by the blue arrows). This compression triggers star formation in the interstellar matter, so that new stars appear on the “downstream” side of the densest p ...
Chapter 31
... – Because many quasars are far away, it takes their light a long time to reach Earth. – The most remote quasars are several billion light-years away, which indicates that they existed billions of years ago. – This suggests that many galaxies went through a quasar stage when they were young. – Today’ ...
... – Because many quasars are far away, it takes their light a long time to reach Earth. – The most remote quasars are several billion light-years away, which indicates that they existed billions of years ago. – This suggests that many galaxies went through a quasar stage when they were young. – Today’ ...
What is a planet? - X-ray and Observational Astronomy Group
... Giordano Bruno said that the fixed stars are really suns like our own, with planets going round them • 1991 Radio astronomers Alex Wolszczan & Dale Frail discovered planets around a pulsar PSR1257+12 – Variations in arrival times of pulses suggests presence of three or more planets – Planets probabl ...
... Giordano Bruno said that the fixed stars are really suns like our own, with planets going round them • 1991 Radio astronomers Alex Wolszczan & Dale Frail discovered planets around a pulsar PSR1257+12 – Variations in arrival times of pulses suggests presence of three or more planets – Planets probabl ...
HON 392 - Chapman University
... Aristotle (384-322 B.C.), On the Heavens 350 B.C. (selections) Ptolemy (100 A.D.-170 A.D.), Almagest circa 150 A.D. ( short selections; "the Almagest had become the standard textbook on astronomy which it was to remain for more than a thousand years... down to the sixteenth century. It was dominant ...
... Aristotle (384-322 B.C.), On the Heavens 350 B.C. (selections) Ptolemy (100 A.D.-170 A.D.), Almagest circa 150 A.D. ( short selections; "the Almagest had become the standard textbook on astronomy which it was to remain for more than a thousand years... down to the sixteenth century. It was dominant ...
In 1929, the astronomer Edwin Hubble observed that the light from
... CMBR fills the Universe. It was first discovered in 1965 by two astronomers called Penzias and Wilson. (i) ...
... CMBR fills the Universe. It was first discovered in 1965 by two astronomers called Penzias and Wilson. (i) ...
Transit surveys for Earths in the habitable zones of white dwarfs
... of transiting planets. I have simulated an all-sky survey with a worldwide network of 1 m aperture telescopes to monitor the white dwarf CHZ (typically 32 hr, during which telescopes distributed in longitude follow a single star) following Nutzman & Charbonneau (2008) to compute the telescope sensit ...
... of transiting planets. I have simulated an all-sky survey with a worldwide network of 1 m aperture telescopes to monitor the white dwarf CHZ (typically 32 hr, during which telescopes distributed in longitude follow a single star) following Nutzman & Charbonneau (2008) to compute the telescope sensit ...
CENTRAL TEXAS COLLEGE
... Each part of the course is not self-contained. You may expect that basic concepts presented at the beginning of the course will be built upon day by day, added to, expanded upon, etc., so that with time you will have both specific and overall understandings. It is important to link together each pie ...
... Each part of the course is not self-contained. You may expect that basic concepts presented at the beginning of the course will be built upon day by day, added to, expanded upon, etc., so that with time you will have both specific and overall understandings. It is important to link together each pie ...
Galaxies * Island universes
... A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer galaxy diameters apart Collisions between galaxies produce irregulars which settle into ellipticals More massive ellipticals hav ...
... A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer galaxy diameters apart Collisions between galaxies produce irregulars which settle into ellipticals More massive ellipticals hav ...
Fermi paradox
The Fermi paradox (or Fermi's paradox) is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilizations, such as in the Drake equation, and the lack of evidence for such civilizations. The basic points of the argument, made by physicists Enrico Fermi and Michael H. Hart, are: The Sun is a typical star, and there are billions of stars in the galaxy that are billions of years older. With high probability, some of these stars will have Earth-like planets, and if the earth is typical, some might develop intelligent life. Some of these civilizations might develop interstellar travel, a step the Earth is investigating now. Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in about a million years.According to this line of thinking, the Earth should already have been visited by extraterrestrial aliens though Fermi saw no convincing evidence of this, nor any signs of alien intelligence anywhere in the observable universe, leading him to ask, ""Where is everybody?""