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Planetary Motions - LathamWHS13-14
... Direction of axis pointing changes every 13,000 years (cycle is 26,000) Polaris vs. Vega ...
... Direction of axis pointing changes every 13,000 years (cycle is 26,000) Polaris vs. Vega ...
1. For most of human history it was believed that Earth was at the
... 19. The light-year is defined to be the 20. If we were to send a radio signal to an advanced civilization in 2012 which is located in the Zeta Reticuli star system approximately 39 light years away, when would the signal arrive at its destination? 21. According to current astronomical data, approxim ...
... 19. The light-year is defined to be the 20. If we were to send a radio signal to an advanced civilization in 2012 which is located in the Zeta Reticuli star system approximately 39 light years away, when would the signal arrive at its destination? 21. According to current astronomical data, approxim ...
History of Astronomy Scavenger Hunt
... Who am I? Stephen Hawking 24. I developed the laws of planetary motion and realized the orbits were elliptical. Who am I? Johannes Kepler 25. I showed that other galaxies existed and observed that the universe is expanding because the other galaxies are all moving away from the Milky Way. Who am I? ...
... Who am I? Stephen Hawking 24. I developed the laws of planetary motion and realized the orbits were elliptical. Who am I? Johannes Kepler 25. I showed that other galaxies existed and observed that the universe is expanding because the other galaxies are all moving away from the Milky Way. Who am I? ...
Carter K 1 - Mrs. Anthony`s English 2
... From what I have read, I think the key to life are all the exoplanets, a planet that orbits a star / sun other than ours. Lonnie Shekhtman said that scientists “found loads of exoplanets” (Shekhtman). According to NASA one fifth of the exoplanets are found in the habitable zone of their sun. Those a ...
... From what I have read, I think the key to life are all the exoplanets, a planet that orbits a star / sun other than ours. Lonnie Shekhtman said that scientists “found loads of exoplanets” (Shekhtman). According to NASA one fifth of the exoplanets are found in the habitable zone of their sun. Those a ...
Physical Geography Exam Review Part 2
... creating a first protosun - The nuclear explosion of this protosun created a T Tauri wind that blew away the gas atmospheres of the inner planets The inner planets continued to grow through accretion This was a very destructive time in the early solar system ...
... creating a first protosun - The nuclear explosion of this protosun created a T Tauri wind that blew away the gas atmospheres of the inner planets The inner planets continued to grow through accretion This was a very destructive time in the early solar system ...
Extrasolar Planets, Lebo, 8-1
... Pegasi • They had lots of archival data from searches for Jupiter-type planets (periods >10 years, so they were still “in progress”) • No one even thought to look for short-period MASSIVE planets (why would they be easier?) • Found many “Hot Jupiters” – most extra-solar planets known today are Hot J ...
... Pegasi • They had lots of archival data from searches for Jupiter-type planets (periods >10 years, so they were still “in progress”) • No one even thought to look for short-period MASSIVE planets (why would they be easier?) • Found many “Hot Jupiters” – most extra-solar planets known today are Hot J ...
Habitable zone - Penn State University
... • It is difficult, or impossible, to imagine how life could get started on a gas giant planet – Need a liquid or solid surface to provide a stable P/T environment ...
... • It is difficult, or impossible, to imagine how life could get started on a gas giant planet – Need a liquid or solid surface to provide a stable P/T environment ...
Intro L4 IQ
... motion of planets are the “geocentric” (Earth-centered) and “heliocentric” (Suncentered) models. The accepted model today is: ...
... motion of planets are the “geocentric” (Earth-centered) and “heliocentric” (Suncentered) models. The accepted model today is: ...
And let there be light!
... The Universe – Everything there is; all energy, space, and matter Astronomy – The study of the universe beyond the earth’s atmosphere. Solar System – the Sun and all the objects that travel around it due to gravitational force. Objects = planets, over 60 satellites (moons) orbiting the planets, thou ...
... The Universe – Everything there is; all energy, space, and matter Astronomy – The study of the universe beyond the earth’s atmosphere. Solar System – the Sun and all the objects that travel around it due to gravitational force. Objects = planets, over 60 satellites (moons) orbiting the planets, thou ...
Revision on Universe 1-The nearest planet to the sun is
... 4-The day hours are nearly equal to the night hours in ………………..and………………. seasons 5-………………………is the nearest space body to the Earth 6-The Earth's axis is ………………………….. 7-Earth is the…………………planet away from the sun 8-The biggest planet in the solar system is …………………………… 9-In the …………………season,hours of ...
... 4-The day hours are nearly equal to the night hours in ………………..and………………. seasons 5-………………………is the nearest space body to the Earth 6-The Earth's axis is ………………………….. 7-Earth is the…………………planet away from the sun 8-The biggest planet in the solar system is …………………………… 9-In the …………………season,hours of ...
Scale Model of the Solar System
... This model of the planets will be on a scale of 1 to 1 billion, or 1:1,000,000,000. This sounds difficult to do but actually it’s very easy because at this scale 1mm = 1,000 kilometres. Good approximations of the sizes of the planets are shown in the table below. Object Sun Mercury Venus Earth Mars ...
... This model of the planets will be on a scale of 1 to 1 billion, or 1:1,000,000,000. This sounds difficult to do but actually it’s very easy because at this scale 1mm = 1,000 kilometres. Good approximations of the sizes of the planets are shown in the table below. Object Sun Mercury Venus Earth Mars ...
8.1 Touring the Night Sky Pg. 308 #1
... 1. Astronomers study what is beyond Earth like stars, planets, and moons, solar systems, even other galaxy’s. 2. Being “luminous” means to have, produce or give off light. For example, the nuclear fusion on the light gives off light that shines on the earth. 3. The Moon reflects light from the sun w ...
... 1. Astronomers study what is beyond Earth like stars, planets, and moons, solar systems, even other galaxy’s. 2. Being “luminous” means to have, produce or give off light. For example, the nuclear fusion on the light gives off light that shines on the earth. 3. The Moon reflects light from the sun w ...
What do we mean by habitable zone?
... would be much more luminous than the Sun), life would be hard-pressed to evolve much even if it managed to originate. As a reminder, the earliest traces of life on Earth go back to something like 800 million years after the formation of the Solar System. Life might have originated before then, but t ...
... would be much more luminous than the Sun), life would be hard-pressed to evolve much even if it managed to originate. As a reminder, the earliest traces of life on Earth go back to something like 800 million years after the formation of the Solar System. Life might have originated before then, but t ...
Relative sizes of astronomical objects
... This image represents the relative sizes of our Sun and Sirius (Alpha Canis Majoris), Pollux (Beta Geminorum) and Arcturus (Alpha Bootes). ‘Giant’ Jupiter is just 1 pixel in this perspective. Earth is invisible on this scale. ...
... This image represents the relative sizes of our Sun and Sirius (Alpha Canis Majoris), Pollux (Beta Geminorum) and Arcturus (Alpha Bootes). ‘Giant’ Jupiter is just 1 pixel in this perspective. Earth is invisible on this scale. ...
Space Unit - Questions and Answers
... surfaces and gets denser as you sink to the middle therefore not possible to land on. Pluto is also an outer planet but it is not a gas giant and it does not seem to be terrestrial. The motion of Pluto’s orbit suggests that Pluto may have been one of Neptune’s moons at one time. Pluto also has a moo ...
... surfaces and gets denser as you sink to the middle therefore not possible to land on. Pluto is also an outer planet but it is not a gas giant and it does not seem to be terrestrial. The motion of Pluto’s orbit suggests that Pluto may have been one of Neptune’s moons at one time. Pluto also has a moo ...
Lecture7 - UCSB Physics
... • The formation of terrestrial planets around a star is thought to have occurred by what process? • A) Breakup of a large disk of matter which formed around the star • B) Condensation of gas from the original star nebula • C) Capture by the star of objects traversing the depths of space • D) Acc ...
... • The formation of terrestrial planets around a star is thought to have occurred by what process? • A) Breakup of a large disk of matter which formed around the star • B) Condensation of gas from the original star nebula • C) Capture by the star of objects traversing the depths of space • D) Acc ...
Name____________________________________________________________________ Astronomy Packet 4
... 2) The innermost planet of the Solar System is________, it also the _____________. Its period of rotation is__________ and its period of Revolution is____________. It is located ________ away from the sun. The surface temperature ranges from ____________ to_________ the widest swing in the solar sy ...
... 2) The innermost planet of the Solar System is________, it also the _____________. Its period of rotation is__________ and its period of Revolution is____________. It is located ________ away from the sun. The surface temperature ranges from ____________ to_________ the widest swing in the solar sy ...
The Planets
... • The outer planets consist mainly of liquid hydrogen and helium and may have a small cores of metal and rock • Outer planets are much larger than the terrestrial planets • Cooler than inner planets • Outer planets have more moons than inner planets ...
... • The outer planets consist mainly of liquid hydrogen and helium and may have a small cores of metal and rock • Outer planets are much larger than the terrestrial planets • Cooler than inner planets • Outer planets have more moons than inner planets ...
day 2 - The Solar System Presentation
... o Long-period comets: originate from a spherical cloud of debris further than Pluto and orbit the Sun in more than 200 years (for example, HaleBopp Comet which takes 2380 years to orbit) When comets come close to the Sun, the surface sublimates (changes from solid to gas) and the icy nucleus heats ...
... o Long-period comets: originate from a spherical cloud of debris further than Pluto and orbit the Sun in more than 200 years (for example, HaleBopp Comet which takes 2380 years to orbit) When comets come close to the Sun, the surface sublimates (changes from solid to gas) and the icy nucleus heats ...
astronomy 2 review sheet - Hicksville Public Schools
... 17. What is the solar wind? ELECTRICALLY CHARGED PARTICLES EXTENDING FROM THE CORONA. 18. Describe a meteor, meteoroid and a meteorite. METEOR- STREAK OF LIGHT AS A METE0ROID BURNS UP IN THE EARTH’S ATMOSPHERE. METEOROID- A CHUNK OF ROCK OR DUST IN SPACE. METEORITE- A METEOROID THAT HITS THE EARTH’S ...
... 17. What is the solar wind? ELECTRICALLY CHARGED PARTICLES EXTENDING FROM THE CORONA. 18. Describe a meteor, meteoroid and a meteorite. METEOR- STREAK OF LIGHT AS A METE0ROID BURNS UP IN THE EARTH’S ATMOSPHERE. METEOROID- A CHUNK OF ROCK OR DUST IN SPACE. METEORITE- A METEOROID THAT HITS THE EARTH’S ...
File
... _______________ are found in a belt area marking the division between the inner and outer planets. The universe is believed to be expanding based on light emitted by stars that has been __________________. 24 hours in a day is caused by Earth’s ____________ on its axis. The term to describe Mars’ ap ...
... _______________ are found in a belt area marking the division between the inner and outer planets. The universe is believed to be expanding based on light emitted by stars that has been __________________. 24 hours in a day is caused by Earth’s ____________ on its axis. The term to describe Mars’ ap ...
How our Solar System (and Moon) came to be
... • As nebula collapsed, internal pressure and temperature increased and more particles were attracted to nebula • Eventually temperature and pressure in the gas cloud was great enough for a complex reaction to begin ...
... • As nebula collapsed, internal pressure and temperature increased and more particles were attracted to nebula • Eventually temperature and pressure in the gas cloud was great enough for a complex reaction to begin ...
Summary of week 1:
... has insufficient mass to become a star (< 80 Jupiter masses) or a brown dwarf (< 13 Jupiter masses). Brown dwarf: A “failed star”, that is, an object more massive than a planet, but insufficient to become a star. These objects typically have fusion reactions involving deuterium early in their life c ...
... has insufficient mass to become a star (< 80 Jupiter masses) or a brown dwarf (< 13 Jupiter masses). Brown dwarf: A “failed star”, that is, an object more massive than a planet, but insufficient to become a star. These objects typically have fusion reactions involving deuterium early in their life c ...
Lecture12
... Jovian Moons: many, including some larger than the planet mercury! Formed in orbit. Tidal heating important. IO has volcanoes, europa liquid water under a thick sheet of ice, titan a dense atmosphere, “lakes” of hydrocarbons, and coastlines. ...
... Jovian Moons: many, including some larger than the planet mercury! Formed in orbit. Tidal heating important. IO has volcanoes, europa liquid water under a thick sheet of ice, titan a dense atmosphere, “lakes” of hydrocarbons, and coastlines. ...
Planetary habitability
![](https://en.wikipedia.org/wiki/Special:FilePath/The_Earth_seen_from_Apollo_17.jpg?width=300)
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.