![The Anglo-Australian Planet Search – XXI. A Gas-Giant](http://s1.studyres.com/store/data/017425927_1-b5883a552c0dd17e79e8e52dcec9e7f0-300x300.png)
The Anglo-Australian Planet Search – XXI. A Gas-Giant
... arranged in an epicyclic configuration, a set of radial-velocity data which can be fit with one eccentric planet can often also be modelled as two planets in near-circular orbits (see e.g. AngladaEscudé et al. 2010, and references therein). Fitting a single planet in a circular (e = 0.0) orbit to o ...
... arranged in an epicyclic configuration, a set of radial-velocity data which can be fit with one eccentric planet can often also be modelled as two planets in near-circular orbits (see e.g. AngladaEscudé et al. 2010, and references therein). Fitting a single planet in a circular (e = 0.0) orbit to o ...
Resources: - Real Science
... Dr Giovanna Tinetti. She is a scientist at the European Space Agency and University College, London. The findings will be published in this week's Nature (July 12). This is the first time that astronomers have been sure there is water on an extrasolar planet. Unfortunately the water is not lying aro ...
... Dr Giovanna Tinetti. She is a scientist at the European Space Agency and University College, London. The findings will be published in this week's Nature (July 12). This is the first time that astronomers have been sure there is water on an extrasolar planet. Unfortunately the water is not lying aro ...
Large and small planets Journey through the Solar System
... Using the table below, write the information from the second column (the diameter) next to the planets on the board. Explain clearly to the children that the Sun is very large, and that it is not a planet at all, but a star. It is interesting to see how large the sun is compared to the planets. Use ...
... Using the table below, write the information from the second column (the diameter) next to the planets on the board. Explain clearly to the children that the Sun is very large, and that it is not a planet at all, but a star. It is interesting to see how large the sun is compared to the planets. Use ...
What theories account for the origin of the solar system?
... Planets of our solar system can be divided into two very different kinds: ...
... Planets of our solar system can be divided into two very different kinds: ...
Target Stars for Earth-like Planet Searches with the Terrestrial
... through low-resolution spectroscopy and other measurements. The high contrast ratio between a star and any nearby planet, the small angular scale required, and the possibility of dust emission masking the planet's signature, combine to make the overall TPF problem challenging. ...
... through low-resolution spectroscopy and other measurements. The high contrast ratio between a star and any nearby planet, the small angular scale required, and the possibility of dust emission masking the planet's signature, combine to make the overall TPF problem challenging. ...
ppt
... Current thinking: They formed out at several AU, then migrated inward due to tidal/friction effects in solar nebula Type I migration: interaction between giant planet and circumstellar gas/dust disk pushes planet inwards Type II migration: Gap in disk opens and migration slows, takes approximately 1 ...
... Current thinking: They formed out at several AU, then migrated inward due to tidal/friction effects in solar nebula Type I migration: interaction between giant planet and circumstellar gas/dust disk pushes planet inwards Type II migration: Gap in disk opens and migration slows, takes approximately 1 ...
Midterm 1 Completion What is the official name of the special star
... wobbling back and forth. The absorption line spectrum has a blueshift (shift to shorter wavelengths) when the star moves towards us and a redshift (shift to longer wavelengths) when the star moves away from us. ...
... wobbling back and forth. The absorption line spectrum has a blueshift (shift to shorter wavelengths) when the star moves towards us and a redshift (shift to longer wavelengths) when the star moves away from us. ...
Intro To The Solar System
... Earth has diameter 0.3 mm. Sun: ~ size of a small plum. Mercury, Venus, Earth, Mars: ~ size of a grain of salt. Jupiter: ~ size of an apple seed. Saturn: ~ slightly smaller than Jupiter’s “apple seed”. ...
... Earth has diameter 0.3 mm. Sun: ~ size of a small plum. Mercury, Venus, Earth, Mars: ~ size of a grain of salt. Jupiter: ~ size of an apple seed. Saturn: ~ slightly smaller than Jupiter’s “apple seed”. ...
Document
... the Sun. If we could live on another planet, our birthdays would occur more or less frequently depending on the planet’s revolution period (the time taken to complete one full trip around the Sun). On a few planets, we couldn’t even celebrate our first birthday because we wouldn’t live long enough t ...
... the Sun. If we could live on another planet, our birthdays would occur more or less frequently depending on the planet’s revolution period (the time taken to complete one full trip around the Sun). On a few planets, we couldn’t even celebrate our first birthday because we wouldn’t live long enough t ...
Circumstellar habitable zone
![](https://commons.wikimedia.org/wiki/Special:FilePath/Habitable_zone_-_HZ.png?width=300)
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.