The Search for Worlds Like Our Own
... quest for other worlds as abodes of life has been one of mankind’s great questions for several millennia. For instance, as stated by Epicurus *300 BC: ‘‘Other worlds, with plants and other living things, some of them similar and some of them different from ours, must exist.’’ Demokritos from Abdera ...
... quest for other worlds as abodes of life has been one of mankind’s great questions for several millennia. For instance, as stated by Epicurus *300 BC: ‘‘Other worlds, with plants and other living things, some of them similar and some of them different from ours, must exist.’’ Demokritos from Abdera ...
A brief history of extra-solar planets - X
... Searching for Earths by transit method Launched last year by NASA Aims to find an Earth around a Sun-like star in a one year orbit Need three transits to confirm So mission lasts at least three years… ...
... Searching for Earths by transit method Launched last year by NASA Aims to find an Earth around a Sun-like star in a one year orbit Need three transits to confirm So mission lasts at least three years… ...
Seeing another Earth: Detecting and Characterizing Rocky Planets
... transiting planets yield constraints on the internal structure and composition of gas giant planets (e.g., Guillot 2005). Data from HST and Spitzer now provide information on the amount of haze (Pont et al. 2008) and the day to night temperature gradient (Knutson et al. 2009) in the atmospheres of g ...
... transiting planets yield constraints on the internal structure and composition of gas giant planets (e.g., Guillot 2005). Data from HST and Spitzer now provide information on the amount of haze (Pont et al. 2008) and the day to night temperature gradient (Knutson et al. 2009) in the atmospheres of g ...
Life and Earth: Philosophical Remedy for Environmental Problems
... 2) The size of a planet is directly related to surface conditions and gravity of the planet. For example, since Mars is relatively small, the gravity is also small. Since gravity is weak, atmosphere concentrations are limited. Therefore, even if Mars was located in the same position as Earth, the th ...
... 2) The size of a planet is directly related to surface conditions and gravity of the planet. For example, since Mars is relatively small, the gravity is also small. Since gravity is weak, atmosphere concentrations are limited. Therefore, even if Mars was located in the same position as Earth, the th ...
Issue #87 of Lunar and Planetary Information Bulletin
... Jupiter, but most of the objects have masses greater than that of Jupiter, up to 10 times more. This fact, coupled with the fact that the objects appear to orbit the stars at relatively close distances (most orbit at less than half the distance of the Earth to the Sun) seems to point to the anomalou ...
... Jupiter, but most of the objects have masses greater than that of Jupiter, up to 10 times more. This fact, coupled with the fact that the objects appear to orbit the stars at relatively close distances (most orbit at less than half the distance of the Earth to the Sun) seems to point to the anomalou ...
In the beginning… Astronomical Observations of Star Formation
... rich in volatiles (C and N) compared to the Earth. ...
... rich in volatiles (C and N) compared to the Earth. ...
All About Astronomy The Planets
... The inner planets (those planets that orbit close to the sun) are quite different from the outer planets (those planets that orbit far from the sun). ...
... The inner planets (those planets that orbit close to the sun) are quite different from the outer planets (those planets that orbit far from the sun). ...
For Chapter 16
... • Much of the incoming solar radiation does not make it to the Earth’s surface – due to atmospheric absorption • Electromagnetic radiation that will pass through the Earth’s atmosphere can be studied using ground-based detectors • Other regions of the electromagnetic spectrum must be detected by spa ...
... • Much of the incoming solar radiation does not make it to the Earth’s surface – due to atmospheric absorption • Electromagnetic radiation that will pass through the Earth’s atmosphere can be studied using ground-based detectors • Other regions of the electromagnetic spectrum must be detected by spa ...
Day 3
... • However, about 1/3 of the hot Jupiters do have a hot upper atmosphere, and we still don’t know ...
... • However, about 1/3 of the hot Jupiters do have a hot upper atmosphere, and we still don’t know ...
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.