免费咨询电话：400-0123-267 托福机经阅读练习：太阳系中的行星
... a gas molecule can "evaporate" from a planet if it reaches a speed known as the escape velocity. For Earth, this velocity is 11 kilometers per second. Any material, including a rocket, must reach this speed before it can leave Earth and go into space. The Jovian planets, because of their greater mas ...
... a gas molecule can "evaporate" from a planet if it reaches a speed known as the escape velocity. For Earth, this velocity is 11 kilometers per second. Any material, including a rocket, must reach this speed before it can leave Earth and go into space. The Jovian planets, because of their greater mas ...
Lecture 6
... Studying the similarities among and differences between the planets this includes moons, asteroids, & comets ...
... Studying the similarities among and differences between the planets this includes moons, asteroids, & comets ...
Here - ScienceA2Z.com
... A planet is any object in orbit around the Sun that has enough mass to form itself into a spherical shape and has cleared its immediate neighborhood of all smaller objects. By this definition, the Solar System has eight known planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptun ...
... A planet is any object in orbit around the Sun that has enough mass to form itself into a spherical shape and has cleared its immediate neighborhood of all smaller objects. By this definition, the Solar System has eight known planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptun ...
ARTICLE A closely packed system of low-mass, low-density planets transiting Kepler-11
... Perturbations of planets Kepler-11d and Kepler-11f by planet Kepler-11e are clearly observed. These variations confirm that all three sets of transits are produced by planets orbiting the same star and yield a 4s detection of the mass of Kepler-11e. Somewhat weaker perturbations are observed in the ...
... Perturbations of planets Kepler-11d and Kepler-11f by planet Kepler-11e are clearly observed. These variations confirm that all three sets of transits are produced by planets orbiting the same star and yield a 4s detection of the mass of Kepler-11e. Somewhat weaker perturbations are observed in the ...
托福tpo - 小马过河
... The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids. An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of th ...
... The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids. An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of th ...
No Slide Title
... • Simulations show a large number of planets form from a single disc. • Only produces gaseous planets – rocky (terrestrial) planets are not formed. • Is not applicable to the solar system. • Could explain the directly imaged HR8799 system Dr. Matt Burleigh ...
... • Simulations show a large number of planets form from a single disc. • Only produces gaseous planets – rocky (terrestrial) planets are not formed. • Is not applicable to the solar system. • Could explain the directly imaged HR8799 system Dr. Matt Burleigh ...
PDF format
... • As of 20 November 2014 1850 planets in 1160 planetary systems have been discovered, including 472 multiple planetary systems. • Rogue planets have been found, not orbiting to any star, traveling through space on their own. • The Kepler mission has detected a few thousand candidate planets, of w ...
... • As of 20 November 2014 1850 planets in 1160 planetary systems have been discovered, including 472 multiple planetary systems. • Rogue planets have been found, not orbiting to any star, traveling through space on their own. • The Kepler mission has detected a few thousand candidate planets, of w ...
托福TPO16阅读word版下载三
... The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids. An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of th ...
... The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids. An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of th ...
DTU_9e_ch09 - University of San Diego Home Pages
... Comet nuclei are fragments of ice and rock often orbiting at a great inclination to the plane of the ecliptic. In the Kuiper belt and Oort cloud, comets have fairly circular orbits. When close to the Sun, they generally move in highly elliptical orbits. Many comet nuclei orbit the Sun in the Kuiper ...
... Comet nuclei are fragments of ice and rock often orbiting at a great inclination to the plane of the ecliptic. In the Kuiper belt and Oort cloud, comets have fairly circular orbits. When close to the Sun, they generally move in highly elliptical orbits. Many comet nuclei orbit the Sun in the Kuiper ...
Solar System Debris - Sierra College Astronomy Home Page
... • Charon’s diameter (1,200 km) is about half that of Pluto • Pluto’s mass is about 12 times that of Charon but only 1/5 that of the moon • Charon density 1.2-1.3 g/cm3; Pluto 1.8-2.1 g/cm3 • Charon is less than 9 Pluto diameters away from Pluto (compare: Moon ¼ diameter of Earth, and 30 Earth diamet ...
... • Charon’s diameter (1,200 km) is about half that of Pluto • Pluto’s mass is about 12 times that of Charon but only 1/5 that of the moon • Charon density 1.2-1.3 g/cm3; Pluto 1.8-2.1 g/cm3 • Charon is less than 9 Pluto diameters away from Pluto (compare: Moon ¼ diameter of Earth, and 30 Earth diamet ...
Section 2 Practice Test
... ____ 17. Which of these gases traps the most heat in Venus’ atmosphere? a. carbon dioxide c. nitrogen b. oxygen d. argon ____ 18. Which of the following best describes the inner planets? a. hot, dry, and dense c. large, light, and gaseous b. small, dense, and rocky d. small, light, and solid ____ 19 ...
... ____ 17. Which of these gases traps the most heat in Venus’ atmosphere? a. carbon dioxide c. nitrogen b. oxygen d. argon ____ 18. Which of the following best describes the inner planets? a. hot, dry, and dense c. large, light, and gaseous b. small, dense, and rocky d. small, light, and solid ____ 19 ...
Blocking Starlight Much Closer to Home 2: This Year`s
... magnitude star than to find a ring around Pluto or to discover a moon. Anyway, we have the light curve of an occultation by that 15th magnitude star, which was the typical brightness of our occultation stars that we were observing anyway. We are about to submit a paper to the Astronomical Journal a ...
... magnitude star than to find a ring around Pluto or to discover a moon. Anyway, we have the light curve of an occultation by that 15th magnitude star, which was the typical brightness of our occultation stars that we were observing anyway. We are about to submit a paper to the Astronomical Journal a ...
ART. VULCAN/05
... physicists. The hypothesis of Vulcan’s existence has been thrown away, after Einstein demonstrated in 1916, with his theory of general relativity, the measure of the precession movement to the planet Mercury, explaining why the orbit of the latter was so uncertain and irregular. Therefore, it becam ...
... physicists. The hypothesis of Vulcan’s existence has been thrown away, after Einstein demonstrated in 1916, with his theory of general relativity, the measure of the precession movement to the planet Mercury, explaining why the orbit of the latter was so uncertain and irregular. Therefore, it becam ...
Pluto and Kuiper Belt Object Notes
... 3) The presence of a satellite allows us to deduce the mass of the planet by applying Newton’s form of Keppler’s third law. Charon is 5 or 10 per cent of Pluto’s mass, and Pluto is only 1/500th the mass of the Earth, ten times less than had been suspected just before the discovery of Charon. 4) Plut ...
... 3) The presence of a satellite allows us to deduce the mass of the planet by applying Newton’s form of Keppler’s third law. Charon is 5 or 10 per cent of Pluto’s mass, and Pluto is only 1/500th the mass of the Earth, ten times less than had been suspected just before the discovery of Charon. 4) Plut ...
The Great Archaean Bombardment (and the Late Heavy
... The LHB was an intense cratering of the terrestrial planets and the Moon that occurred between 3.8 and 4.1 Gyr ago. The most likely trigger for the onset of the LHB was a dynamical instability in the outer solar system which made the giant planets scatter each other. The eccentric giant planets and ...
... The LHB was an intense cratering of the terrestrial planets and the Moon that occurred between 3.8 and 4.1 Gyr ago. The most likely trigger for the onset of the LHB was a dynamical instability in the outer solar system which made the giant planets scatter each other. The eccentric giant planets and ...
the probabilities of collisions
... The larger value of P for Earth we have calculated compared to those argued by Morbidelli et al. [2000] (P (1-3)10-6) and Levison et al. [2001] (P = 410-7 ) is caused by the fact that in our runs we considered a larger number of Jupiter-crossing objects and the main portion of the probability of ...
... The larger value of P for Earth we have calculated compared to those argued by Morbidelli et al. [2000] (P (1-3)10-6) and Levison et al. [2001] (P = 410-7 ) is caused by the fact that in our runs we considered a larger number of Jupiter-crossing objects and the main portion of the probability of ...
Search for Other Worlds - Science fiction 20 years
... of wavefront error are understood.’ (Lunine 2009) At that level of precision, groundbased astrometry will concern itself chiefly with finding giant planets and determining their masses and orbits. Radial Velocity or Doppler Method 13. As a star moves in its orbit around a system's center of mass, it ...
... of wavefront error are understood.’ (Lunine 2009) At that level of precision, groundbased astrometry will concern itself chiefly with finding giant planets and determining their masses and orbits. Radial Velocity or Doppler Method 13. As a star moves in its orbit around a system's center of mass, it ...
Planetary Satellites,Asteroids,Comets
... of discovered moons has doubled, with each of the giant planets having had several small (below 20 km) moons identified by astronomers using large ground-based telescopes. It is anticipated, however, that the number could well treble over the next decade, as more distant moons ranging down to about ...
... of discovered moons has doubled, with each of the giant planets having had several small (below 20 km) moons identified by astronomers using large ground-based telescopes. It is anticipated, however, that the number could well treble over the next decade, as more distant moons ranging down to about ...
Planets In Our Solar System
... Planets In Our Solar System Fact #3 Use your Cipher Wheel to decode a fact about Planets In Our Solar System. Use 27 = Q as the reference point on your wheel. ...
... Planets In Our Solar System Fact #3 Use your Cipher Wheel to decode a fact about Planets In Our Solar System. Use 27 = Q as the reference point on your wheel. ...
ASTR 380 Possibilities for Life on the Moons of Giant Planets
... Ganymede, and the water was warm. -- perhaps there was a Titan type atmosphere on Europa or Ganymede that has now been lost. We need to explore these moons more to know. ...
... Ganymede, and the water was warm. -- perhaps there was a Titan type atmosphere on Europa or Ganymede that has now been lost. We need to explore these moons more to know. ...
... particles that may be detrimental to life. We study the impact of a strong flare from the M dwarf, AD Leo, on the atmospheric chemistry of a hypothetical Earth-like planet located in the habitable zone. The simulations were performed using a 1-D photochemical model. We simulated six atmospheres with ...
The Cosmic Perspective Other Planetary Systems: The New Science
... • GAIA is a European mission planned for 2013 that will use interferometry to measure precise motions of a billion stars © 2014 Pearson Education, Inc. ...
... • GAIA is a European mission planned for 2013 that will use interferometry to measure precise motions of a billion stars © 2014 Pearson Education, Inc. ...
Neither Star nor Planet - Max-Planck
... Joergens and her colleagues started to scan brown dwarfs for companions with one of the 8-meter telescopes of the Very Large Telescope of the European Southern Observatory in Chile; these should become evident in the spectrum by virtue of a Doppler shift. Although the researchers haven’t yet found a ...
... Joergens and her colleagues started to scan brown dwarfs for companions with one of the 8-meter telescopes of the Very Large Telescope of the European Southern Observatory in Chile; these should become evident in the spectrum by virtue of a Doppler shift. Although the researchers haven’t yet found a ...
Probabilities of Collisions of Migrating Bodies and Dust Particles
... The larger value of P for Earth we have calculated compared to those argued by Morbidelli et al. [2000] (P (1-3)10-6) and Levison et al. [2001] (P = 410-7 ) is caused by the fact that in our runs we considered a larger number of Jupiter-crossing objects and the main portion of the probability of ...
... The larger value of P for Earth we have calculated compared to those argued by Morbidelli et al. [2000] (P (1-3)10-6) and Levison et al. [2001] (P = 410-7 ) is caused by the fact that in our runs we considered a larger number of Jupiter-crossing objects and the main portion of the probability of ...
Planetary Evolution - Lincoln-Sudbury Regional High School
... see the heat released from the Earth’s still hot mantle in volcanic activity. There is another particularly clear piece of evidence for this: ...
... see the heat released from the Earth’s still hot mantle in volcanic activity. There is another particularly clear piece of evidence for this: ...
Dwarf planet
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite. That is, it is in direct orbit of the Sun, and is massive enough for its shape to be in hydrostatic equilibrium under its own gravity, but has not cleared the neighborhood around its orbit.The term dwarf planet was adopted in 2006 as part of a three-way categorization of bodies orbiting the Sun, brought about by an increase in discoveries of objects farther away from the Sun than Neptune that rivaled Pluto in size, and finally precipitated by the discovery of an even more massive object, Eris. The exclusion of dwarf planets from the roster of planets by the IAU has been both praised and criticized; it was said to be the ""right decision"" by astronomer Mike Brown, who discovered Eris and other new dwarf planets, but has been rejected by Alan Stern, who had coined the term dwarf planet in 1990.The International Astronomical Union (IAU) currently recognizes five dwarf planets: Ceres, Pluto, Haumea, Makemake, and Eris. Brown criticizes this official recognition: ""A reasonable person might think that this means that there are five known objects in the solar system which fit the IAU definition of dwarf planet, but this reasonable person would be nowhere close to correct.""It is suspected that another hundred or so known objects in the Solar System are dwarf planets. Estimates are that up to 200 dwarf planets may be found when the entire region known as the Kuiper belt is explored, and that the number may exceed 10,000 when objects scattered outside the Kuiper belt are considered. Individual astronomers recognize several of these, and in August 2011 Mike Brown published a list of 390 candidate objects, ranging from ""nearly certain"" to ""possible"" dwarf planets. Brown currently identifies eleven known objects – the five accepted by the IAU plus 2007 OR10, Quaoar, Sedna, Orcus, 2002 MS4 and Salacia – as ""virtually certain"", with another dozen highly likely. Stern states that there are more than a dozen known dwarf planets.However, only two of these bodies, Ceres and Pluto, have been observed in enough detail to demonstrate that they actually fit the IAU's definition. The IAU accepted Eris as a dwarf planet because it is more massive than Pluto. They subsequently decided that unnamed trans-Neptunian objects with an absolute magnitude brighter than +1 (and hence a diameter of ≥838 km assuming a geometric albedo of ≤1) are to be named under the assumption that they are dwarf planets. The only two such objects known at the time, Makemake and Haumea, went through this naming procedure and were declared to be dwarf planets. The question of whether other likely objects are dwarf planets has never been addressed by the IAU. The classification of bodies in other planetary systems with the characteristics of dwarf planets has not been addressed.