4 Kepler`s Laws - NMSU Astronomy
... Throughout human history, the motion of the planets in the sky was a mystery: why did some planets move quickly across the sky, while other planets moved very slowly? Even two thousand years ago it was apparent that the motion of the planets was very complex. For example, Mercury and Venus never str ...
... Throughout human history, the motion of the planets in the sky was a mystery: why did some planets move quickly across the sky, while other planets moved very slowly? Even two thousand years ago it was apparent that the motion of the planets was very complex. For example, Mercury and Venus never str ...
Starspots (AIP – Klaus G
... Magnetic fields likely play an important role in almost any astrophysical target, from the early Universe to the Sun, Earth, and its environment. While numerical 3-D MHD simulations became more and more sophisticated in the previous years, magnetic-field observations are still extremely rare (except ...
... Magnetic fields likely play an important role in almost any astrophysical target, from the early Universe to the Sun, Earth, and its environment. While numerical 3-D MHD simulations became more and more sophisticated in the previous years, magnetic-field observations are still extremely rare (except ...
ph709-14
... star HD 209458 was shown to indicate the presence of a large exoplanet in transit across its surface from the perspective of Earth (1.7% dimming). Subsequent spectroscopic studies with the Hubble Space Telescope have even indicated that the exoplanet's atmosphere must have sodium vapor in it. The pl ...
... star HD 209458 was shown to indicate the presence of a large exoplanet in transit across its surface from the perspective of Earth (1.7% dimming). Subsequent spectroscopic studies with the Hubble Space Telescope have even indicated that the exoplanet's atmosphere must have sodium vapor in it. The pl ...
The Search for Extrasolar Planets
... ELODIE spectrograph in the Haute-Provence Observatory. The planet has a mass of 0.44 MJ and an orbital period of 4.23 days, which means it orbits at a distance of 0.05 AU from its host star. Thus, this planet turns out to be very different from planets in our Solar System. All previous formation the ...
... ELODIE spectrograph in the Haute-Provence Observatory. The planet has a mass of 0.44 MJ and an orbital period of 4.23 days, which means it orbits at a distance of 0.05 AU from its host star. Thus, this planet turns out to be very different from planets in our Solar System. All previous formation the ...
The Cosmic Perspective Other Planetary Systems: The New Science
... formation of gas giant planets close to a star. b) The hot Jupiters are close to cool stars, and so are not actually very hot and have the same history as gas giants in our solar system. c) These gas giants formed far from the star and migrated inward due to gas drag in the nebula. d) These gas g ...
... formation of gas giant planets close to a star. b) The hot Jupiters are close to cool stars, and so are not actually very hot and have the same history as gas giants in our solar system. c) These gas giants formed far from the star and migrated inward due to gas drag in the nebula. d) These gas g ...
Document
... ratio of Type I & II migration may be less than previously thought (Winn et al. 2010) one cannot distinguish between p-p scattering and Kozai migration by spin-orbit misalignments or eccentricities alone Need to search for counterparts of migration processes very long term radial velocity me ...
... ratio of Type I & II migration may be less than previously thought (Winn et al. 2010) one cannot distinguish between p-p scattering and Kozai migration by spin-orbit misalignments or eccentricities alone Need to search for counterparts of migration processes very long term radial velocity me ...
Chapter 15 The Formation of Planetary Systems
... to be very different from our own--this came as a surprise. 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 b ...
... to be very different from our own--this came as a surprise. 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 b ...
Stephen Ashworth
... body, and even an Earth-sized one, might not be able to fulfill a criterion of dynamical dominance if located sufficiently far from the Sun. At present the qualifier dwarf is being used to indicate low values of a quantity which is essentially that body’s mass divided by some function of its distanc ...
... body, and even an Earth-sized one, might not be able to fulfill a criterion of dynamical dominance if located sufficiently far from the Sun. At present the qualifier dwarf is being used to indicate low values of a quantity which is essentially that body’s mass divided by some function of its distanc ...
Circumstellar habitable zone
In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the region around a star within which planetary-mass objects with sufficient atmospheric pressure can support liquid water at their surfaces. The bounds of the CHZ are calculated using the known requirements of Earth's biosphere, its position in the Solar System and the amount of radiant energy it receives from the Sun. Due to the importance of liquid water to life as it exists on Earth, the nature of the CHZ and the objects within is believed to be instrumental in determining the scope and distribution of Earth-like extraterrestrial life and intelligence.The habitable zone is also called the Goldilocks zone, a metaphor of the children's fairy tale of Goldilocks and the Three Bears, in which a little girl chooses from sets of three items, ignoring the ones that are too extreme (large or small, hot or cold, etc.), and settling on the one in the middle, which is ""just right"".Since the concept was first presented in 1953, stars have been confirmed to possess a CHZ planet, including some systems that consist of multiple CHZ planets. Most such planets, being super-Earths or gas giants, are more massive than Earth, because such planets are easier to detect. On November 4, 2013, astronomers reported, based on Kepler 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 in the Milky Way. 11 billion of these may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists. The CHZ is also of particular interest to the emerging field of habitability of natural satellites, because planetary-mass moons in the CHZ might outnumber planets.In subsequent decades, the CHZ concept began to be challenged as a primary criterion for life. Since the discovery of evidence for extraterrestrial liquid water, substantial quantities of it are now believed to occur outside the circumstellar habitable zone. Sustained by other energy sources, such as tidal heating or radioactive decay or pressurized by other non-atmospheric means, the basic conditions for water-dependent life may be found even in interstellar space, on rogue planets, or their moons. In addition, other circumstellar zones, where non-water solvents favorable to hypothetical life based on alternative biochemistries could exist in liquid form at the surface, have been proposed.