Regents Earth Science Curriculum
... The Key Ideas The key ideas are broad, unifying, general statements that represent knowledge within a domain. They represent a thematic or conceptual body of knowledge of what students should know. The Performance Objectives The Performance Indicators are derived from the Key Ideas in the Core Curri ...
... The Key Ideas The key ideas are broad, unifying, general statements that represent knowledge within a domain. They represent a thematic or conceptual body of knowledge of what students should know. The Performance Objectives The Performance Indicators are derived from the Key Ideas in the Core Curri ...
NASA-TV Highlights
... Does night already seem to be falling about as early as it ever will? You're right! We're still a whole month away from the winter solstice — but the Sun sets its earliest around December 7th, and right now it already sets within only about 5 minutes of that time (if you're near latitude 40° north). ...
... Does night already seem to be falling about as early as it ever will? You're right! We're still a whole month away from the winter solstice — but the Sun sets its earliest around December 7th, and right now it already sets within only about 5 minutes of that time (if you're near latitude 40° north). ...
Lecture 2 Astronomical Distances
... 5 mag = 100 x fainter = 10 x farther away 25 mag = 1010 x fainter = 105 x farther away Distance to a sun-like mV = +1 mag star: 8 x 105 light minutes = 1.5 light years ...
... 5 mag = 100 x fainter = 10 x farther away 25 mag = 1010 x fainter = 105 x farther away Distance to a sun-like mV = +1 mag star: 8 x 105 light minutes = 1.5 light years ...
Constraining tidal dissipation in F-type main
... where γR 0.22 R is the gyration radius of the star (Siess et al. 2000), Qs its modified tidal quality factor, here assumed to be Qs = 106 , a the semimajor axis of the orbit, and G the gravitation constant (see Mardling & Lin 2002). Equation (2) is valid for circular orbits and when the spin axi ...
... where γR 0.22 R is the gyration radius of the star (Siess et al. 2000), Qs its modified tidal quality factor, here assumed to be Qs = 106 , a the semimajor axis of the orbit, and G the gravitation constant (see Mardling & Lin 2002). Equation (2) is valid for circular orbits and when the spin axi ...
The HERMES GALAH survey: overview
... 300 pc. Near the sun, the thick disk is more metal poor, although the abundance ranges of the thick and thin disk stars overlap. The thin disk stars have [Fe/H] in the range 0.7 to +0.5, while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The si ...
... 300 pc. Near the sun, the thick disk is more metal poor, although the abundance ranges of the thick and thin disk stars overlap. The thin disk stars have [Fe/H] in the range 0.7 to +0.5, while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The si ...
Superstars of Astronomy: Debra Fischer transcript
... There’s so much yet to be discovered in the universe, and you’ve played such a big part of that in the last couple of decades here. It reminds me of that book that Martin Harwit wrote years ago, Cosmic Discovery, in which he claimed that we know about maybe 20 percent tops of the kinds of phenomena ...
... There’s so much yet to be discovered in the universe, and you’ve played such a big part of that in the last couple of decades here. It reminds me of that book that Martin Harwit wrote years ago, Cosmic Discovery, in which he claimed that we know about maybe 20 percent tops of the kinds of phenomena ...
Astronomy Lessons - Duke Mathematics Department
... planet heated the material to melting. Initially the Solar system contained hundreds of small “planetesimals.” Some of these merged to form the planets, others were ejected from the system by collisions, so that by 3 billion years ago interplanetary space had become almost empty. Our leading theory ...
... planet heated the material to melting. Initially the Solar system contained hundreds of small “planetesimals.” Some of these merged to form the planets, others were ejected from the system by collisions, so that by 3 billion years ago interplanetary space had become almost empty. Our leading theory ...
Astronomy Lessons - Duke Math
... force applied to those same objects by an ant, while nonzero, is too small to be measured because the mass of an ant is so small. Similarly, the force applied to objects by a distant galaxy is negligible despite the galaxy's great mass due to its immense distance. The force of gravity causes an unsu ...
... force applied to those same objects by an ant, while nonzero, is too small to be measured because the mass of an ant is so small. Similarly, the force applied to objects by a distant galaxy is negligible despite the galaxy's great mass due to its immense distance. The force of gravity causes an unsu ...
The Milky Way disk
... Being the galaxy we live in, the Milky Way has always attracted a lot of attention. The last couple of decades have been dominated by the concept of astronomical survey, and well-known examples are 2MASS, WISE, SDSS/SEGUE, APOGEE, and many others. These surveys, and the future ones, are generating e ...
... Being the galaxy we live in, the Milky Way has always attracted a lot of attention. The last couple of decades have been dominated by the concept of astronomical survey, and well-known examples are 2MASS, WISE, SDSS/SEGUE, APOGEE, and many others. These surveys, and the future ones, are generating e ...
How we think the planets were born
... "There are innumerable worlds which differ in size. In some worlds there is no sun and moon, in others they are larger than in our world, and in others more numerous. They are destroyed by colliding with each other. There are some worlds without any living creatures, plants, or moisture.” - Hippolyt ...
... "There are innumerable worlds which differ in size. In some worlds there is no sun and moon, in others they are larger than in our world, and in others more numerous. They are destroyed by colliding with each other. There are some worlds without any living creatures, plants, or moisture.” - Hippolyt ...
sections 19-22 instructor notes
... Currently available data do indicate that A ≈ –B, so a constant circular velocity does appear to exist locally. The case for (R) = constant = 0 is referred to as a flat rotation curve, and seems to be appropriate for nearly all spiral galaxies, not just the Milky Way. Available data from radio st ...
... Currently available data do indicate that A ≈ –B, so a constant circular velocity does appear to exist locally. The case for (R) = constant = 0 is referred to as a flat rotation curve, and seems to be appropriate for nearly all spiral galaxies, not just the Milky Way. Available data from radio st ...
Interpretation of the Helix Planetary Nebula using Hydro
... and other lensed quasar systems have now firmly established the fact that the mass of galaxies within all radii containing the stars must be dominated by planets (Colley & Schild 2003; Schild 2004a; Schild 2004b; Gibson 2006a; Gibson 2006b). The non-baryonic dark matter of galaxies (probably a mix o ...
... and other lensed quasar systems have now firmly established the fact that the mass of galaxies within all radii containing the stars must be dominated by planets (Colley & Schild 2003; Schild 2004a; Schild 2004b; Gibson 2006a; Gibson 2006b). The non-baryonic dark matter of galaxies (probably a mix o ...
Galaxy Spiral Arms
... Simple Newtonian gravitation is sufficient to explain the entire existence and behavior of Galaxy Spiral Arms, including their long-term stability. The well-known Keplerian centripetal force effect certainly dominates even though Isaac Newton downplayed its importance, but a tapering-shaped Spiral A ...
... Simple Newtonian gravitation is sufficient to explain the entire existence and behavior of Galaxy Spiral Arms, including their long-term stability. The well-known Keplerian centripetal force effect certainly dominates even though Isaac Newton downplayed its importance, but a tapering-shaped Spiral A ...
Science Quarter 3 Lessons
... Note 1: This content can be taught in conjunction with the following ESS content: Everything on or anywhere near Earth is pulled toward Earth's center by gravitational force. Weight is a measure of this force. The planets are kept in orbit due to their gravitational attraction for the sun. Note 2: W ...
... Note 1: This content can be taught in conjunction with the following ESS content: Everything on or anywhere near Earth is pulled toward Earth's center by gravitational force. Weight is a measure of this force. The planets are kept in orbit due to their gravitational attraction for the sun. Note 2: W ...
Rare Earth hypothesis
In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.