EXOPLANETS The search for planets beyond our solar system
... a star, say, deep in the central bulge of the Milky Way, by a foreground (possibly invisible) ‘microlensing’ star close to its line of sight from Earth. Any planets around this star, when in the right position, will produce a sudden increase or decease in the brightening. Microlensing is more sensit ...
... a star, say, deep in the central bulge of the Milky Way, by a foreground (possibly invisible) ‘microlensing’ star close to its line of sight from Earth. Any planets around this star, when in the right position, will produce a sudden increase or decease in the brightening. Microlensing is more sensit ...
Space - Great Barr Academy
... Earth is the only KNOWN planet that capable of supporting life. This does not mean that it is the only one! ...
... Earth is the only KNOWN planet that capable of supporting life. This does not mean that it is the only one! ...
Lifetimes of stars
... • The Sun (and all stars) will eventually run out of fuel (hydrogen in regions where it is hot enough for fusion). • If all the hydrogen in the Sun could fuse to helium, the Sun’s lifetime would be 100 billion years. • But, by the time about 10% of the Sun’s H has been converted into He the solar st ...
... • The Sun (and all stars) will eventually run out of fuel (hydrogen in regions where it is hot enough for fusion). • If all the hydrogen in the Sun could fuse to helium, the Sun’s lifetime would be 100 billion years. • But, by the time about 10% of the Sun’s H has been converted into He the solar st ...
Our_Unique_Planet
... “Magnetic Field” surrounding the earth. This provides protection from hard stellar radiation (ex. Solar Wind ) for us as well as keeping the atmosphere from being ...
... “Magnetic Field” surrounding the earth. This provides protection from hard stellar radiation (ex. Solar Wind ) for us as well as keeping the atmosphere from being ...
Stars
... neutron star will rotate, as did the original star, but much faster (think about a twirling ice skater). Charged particles trapped by the magnetic field will radiate energy at radio wavelengths, but most of this radiation comes out along the poles of the pulsar. The radio emissions are like a search ...
... neutron star will rotate, as did the original star, but much faster (think about a twirling ice skater). Charged particles trapped by the magnetic field will radiate energy at radio wavelengths, but most of this radiation comes out along the poles of the pulsar. The radio emissions are like a search ...
Chapter 27 Stars and Galaxies
... The Sun is similar to most other stars in our galaxy: ►A large ball of gas made mostly of hydrogen and helium held together ...
... The Sun is similar to most other stars in our galaxy: ►A large ball of gas made mostly of hydrogen and helium held together ...
Formation of Solar System
... charged particles creates a magnetic field. The nucleus of the solar nebula thus had a magnetic field associated with it. Matter close to the nucleus was also partially ionised and moved with it. T for disc fell as we moved away from the nucleus so that more and more electrically neutral molecules ...
... charged particles creates a magnetic field. The nucleus of the solar nebula thus had a magnetic field associated with it. Matter close to the nucleus was also partially ionised and moved with it. T for disc fell as we moved away from the nucleus so that more and more electrically neutral molecules ...
Big Bang Theory
... rotating cloud of interstellar dust and gas enriched with heavy elements released by supernovas. • The rotation of the nebula caused it to flatten, and gravity contracted the material near the center into a ...
... rotating cloud of interstellar dust and gas enriched with heavy elements released by supernovas. • The rotation of the nebula caused it to flatten, and gravity contracted the material near the center into a ...
Chapter 0
... A planet has 4 times the mass of the earth, but the acceleration due to gravity on the planet’s surface is the same as on the earth’s surface. The planet’s radius is ...
... A planet has 4 times the mass of the earth, but the acceleration due to gravity on the planet’s surface is the same as on the earth’s surface. The planet’s radius is ...
AY 20 Fall 2010
... Example 2.2.1 Carroll and Ostlie: force exerted on a point mass by a spherically symmetric mass also F= GMm/r2 (all mass of larger body in effect concentrated at center) ...
... Example 2.2.1 Carroll and Ostlie: force exerted on a point mass by a spherically symmetric mass also F= GMm/r2 (all mass of larger body in effect concentrated at center) ...
EARTH & SPACE SCIENCE
... • Kuiper belt a region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice. • In recent years, scientists have discovered hundreds of objects in our solar system beyond Neptune’s orbit. • Some objects are more than half of Pluto’s size. • Sc ...
... • Kuiper belt a region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice. • In recent years, scientists have discovered hundreds of objects in our solar system beyond Neptune’s orbit. • Some objects are more than half of Pluto’s size. • Sc ...
Astro 205 Ch. 2
... • Retrograde moBon occurs when Earth overtakes another planet and it appears to move backward (E to W) against the backdrop of stars. • Explaining retrograde moBon was one of the main reasons astronome ...
... • Retrograde moBon occurs when Earth overtakes another planet and it appears to move backward (E to W) against the backdrop of stars. • Explaining retrograde moBon was one of the main reasons astronome ...
Class 1: From Astrology to Astronomy
... means “Earth.” • Most ancient astronomers used a geocentric system. ...
... means “Earth.” • Most ancient astronomers used a geocentric system. ...
Habitability of planets around Red Dwarf Stars
... out on the perpetually dark side of a synchronously rotating planet (SRP). The proportion of photosynthetically active radiation (PAR) in their output is smaller than solar (Pollard, 1979) and many dM stars are notable for the frequency and intensity of their flares (‘flare stars’), which has been c ...
... out on the perpetually dark side of a synchronously rotating planet (SRP). The proportion of photosynthetically active radiation (PAR) in their output is smaller than solar (Pollard, 1979) and many dM stars are notable for the frequency and intensity of their flares (‘flare stars’), which has been c ...
Printable version: Pluto demoted -- from 9th planet to just a dwarf
... "But there are many more Plutos just waiting to be discovered." For schoolchildren and new textbooks, the new mnemonic for quick learning in elementary astronomy will have to go something like this: "My Very Earnest Mother Just Served Us Nothing" -- instead of the old way that used to end in "Nine P ...
... "But there are many more Plutos just waiting to be discovered." For schoolchildren and new textbooks, the new mnemonic for quick learning in elementary astronomy will have to go something like this: "My Very Earnest Mother Just Served Us Nothing" -- instead of the old way that used to end in "Nine P ...
Solar System Project
... assigned on a variety of different topics written and visual report on a constellation of their choice and presents the information through a combination of written, visual and oral presentations. Each student will be required to turn in a Solar System Model and Display Board on the planet assigned. ...
... assigned on a variety of different topics written and visual report on a constellation of their choice and presents the information through a combination of written, visual and oral presentations. Each student will be required to turn in a Solar System Model and Display Board on the planet assigned. ...
Class 26: EXAM 2
... A) Telescopes have much more magnification and better angular resolution. B) Telescopes can collect far more light with far better angular resolution. C) Telescopes collect more light and are unaffected by twinkling. D) Telescopes can collect far more light with far greater magnification. E) Telesco ...
... A) Telescopes have much more magnification and better angular resolution. B) Telescopes can collect far more light with far better angular resolution. C) Telescopes collect more light and are unaffected by twinkling. D) Telescopes can collect far more light with far greater magnification. E) Telesco ...
Lecture6
... Earth moves around sun ➠ nearby stars “shift” compared to background stars due to “parallax”. The lack of apparent parallax convinced greeks that earth must not move. In reality, stars distances are so great, their parallax is too small to see with the ...
... Earth moves around sun ➠ nearby stars “shift” compared to background stars due to “parallax”. The lack of apparent parallax convinced greeks that earth must not move. In reality, stars distances are so great, their parallax is too small to see with the ...
How is the universe both predictable and unpredictable at the same
... B. Galaxies The solar system is in the ________________ ______________ galaxy. It is a _____________________ type galaxy. C. Shape - Earth, the planets, and the stars are nearly ___________________. D. Telescopes Objects that can be seen with the naked eye: ...
... B. Galaxies The solar system is in the ________________ ______________ galaxy. It is a _____________________ type galaxy. C. Shape - Earth, the planets, and the stars are nearly ___________________. D. Telescopes Objects that can be seen with the naked eye: ...
Review 2
... Internal structure of our Sun and its chemical composition. What is the convection zone on the Sun and what are the granules and supergranules? What is the temperature in the Sun’s core? What is the photosphere, chromosphere and corona? What is their temperature and what causes their color? What is ...
... Internal structure of our Sun and its chemical composition. What is the convection zone on the Sun and what are the granules and supergranules? What is the temperature in the Sun’s core? What is the photosphere, chromosphere and corona? What is their temperature and what causes their color? What is ...
(Earth-like) planets
... by volcanism to build back up in the atmosphere. The increased CO2 strengthens the greenhouse effect and warms the planet back up. It is important to note that the CO2 cycle operates on a time scale of a few hundred thousand years, which means it has no effect on short-term changes. If humans pump a ...
... by volcanism to build back up in the atmosphere. The increased CO2 strengthens the greenhouse effect and warms the planet back up. It is important to note that the CO2 cycle operates on a time scale of a few hundred thousand years, which means it has no effect on short-term changes. If humans pump a ...
STUDY GUIDE Multiple Choice Identify the choice that best
... b. can be calculated from its absolute brightness and mass. c. is greater as distance from the sun increases. d. is a measure of its light viewed from any position. ...
... b. can be calculated from its absolute brightness and mass. c. is greater as distance from the sun increases. d. is a measure of its light viewed from any position. ...
Categorizing Solar System Objects
... Triton, satellite of Neptune – Triton is covered in ice and may have a weak atmosphere. Venus, planet – Vesta, asteroid – Vesta has an interesting surface with clear light and dark regions, unlike most other asteroids, meaning that it is made up of many different elements. Wild 2, comet – ...
... Triton, satellite of Neptune – Triton is covered in ice and may have a weak atmosphere. Venus, planet – Vesta, asteroid – Vesta has an interesting surface with clear light and dark regions, unlike most other asteroids, meaning that it is made up of many different elements. Wild 2, comet – ...
Planetary habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body, a theoretical process known as panspermia. As the existence of life beyond Earth is unknown, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favourable to life's flourishing—in particular those factors that have sustained complex, multicellular organisms and not just simpler, unicellular creatures. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology.An absolute requirement for life is an energy source, and the notion of planetary habitability implies that many other geophysical, geochemical, and astrophysical criteria must be met before an astronomical body can support life. In its astrobiology roadmap, NASA has defined the principal habitability criteria as ""extended regions of liquid water, conditions favourable for the assembly of complex organic molecules, and energy sources to sustain metabolism.""In determining the habitability potential of a body, studies focus on its bulk composition, orbital properties, atmosphere, and potential chemical interactions. Stellar characteristics of importance include mass and luminosity, stable variability, and high metallicity. Rocky, terrestrial-type planets and moons with the potential for Earth-like chemistry are a primary focus of astrobiological research, although more speculative habitability theories occasionally examine alternative biochemistries and other types of astronomical bodies.The idea that planets beyond Earth might host life is an ancient one, though historically it was framed by philosophy as much as physical science. The late 20th century saw two breakthroughs in the field. The observation and robotic spacecraft exploration of other planets and moons within the Solar System has provided critical information on defining habitability criteria and allowed for substantial geophysical comparisons between the Earth and other bodies. The discovery of extrasolar planets, beginning in the early 1990s and accelerating thereafter, has provided further information for the study of possible extraterrestrial life. These findings confirm that the Sun is not unique among stars in hosting planets and expands the habitability research horizon beyond the Solar System.The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only 10–17 million years old. According to the panspermia hypothesis, microscopic life—distributed by meteoroids, asteroids and other small Solar System bodies—may exist throughout the universe. Nonetheless, Earth is the only place in the universe known to harbor life. Estimates of habitable zones around other stars, along with the discovery of hundreds of extrasolar planets and new insights into the extreme habitats here on Earth, suggest that there may be many more habitable places in the universe than considered possible until very recently. On 4 November 2013, astronomers reported, based on Kepler space mission 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 within the Milky Way. 11 billion of these estimated planets may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists.