THE SOLAR SYSTEM
... Jovian). Pluto is considered by many astronomers to no longer be a planet, since there are now several known objects in orbits similar to Pluto's and of similar size - these are believed to be members of the Kuiper-belt. In addition to the major planets, there are a large number of moons, asteroids, ...
... Jovian). Pluto is considered by many astronomers to no longer be a planet, since there are now several known objects in orbits similar to Pluto's and of similar size - these are believed to be members of the Kuiper-belt. In addition to the major planets, there are a large number of moons, asteroids, ...
Asteroids
... named for Jan H. Oort, who proposed its existence in 1950. It has been hypothesized that the Oort Cloud is responsible for the periodic mass extinctions on Earth. Short-period Comets (comets with an orbital period under 200 years): The Kuiper belt is a region beyond Neptune in which at least 70,000 ...
... named for Jan H. Oort, who proposed its existence in 1950. It has been hypothesized that the Oort Cloud is responsible for the periodic mass extinctions on Earth. Short-period Comets (comets with an orbital period under 200 years): The Kuiper belt is a region beyond Neptune in which at least 70,000 ...
The universe and our planet
... galaxy clusters. A galaxy is a large group of stars: between 100 000 and 500 million. Towards the centre of the galaxy, the stars are close together, but in the outer areas of the galaxy they are farther apart. Stars are made up mainly of hydrogen and helium, the two most abundant gases in the unive ...
... galaxy clusters. A galaxy is a large group of stars: between 100 000 and 500 million. Towards the centre of the galaxy, the stars are close together, but in the outer areas of the galaxy they are farther apart. Stars are made up mainly of hydrogen and helium, the two most abundant gases in the unive ...
High Contrast - University of Arizona
... presumed epoch of planet-building via the formation and agglomerative growth of embryonic bodies, and the subsequent accretion of gaseous atmospheres onto hot giant planets, is attendant with a significant decline in the gas-to-dust ratios in the remnant protostellar environments. In this critical p ...
... presumed epoch of planet-building via the formation and agglomerative growth of embryonic bodies, and the subsequent accretion of gaseous atmospheres onto hot giant planets, is attendant with a significant decline in the gas-to-dust ratios in the remnant protostellar environments. In this critical p ...
day04
... • Edmond Halley predicted a comet would return in 1758 and every 76 years after that. (seen in 1910, 1986, and will return in 2061) Halley’s comet has an elliptical orbit extending out past Neptune. • William Herschel discovered Uranus in 1781 by accident. • After 50 years it was seen to deviate fro ...
... • Edmond Halley predicted a comet would return in 1758 and every 76 years after that. (seen in 1910, 1986, and will return in 2061) Halley’s comet has an elliptical orbit extending out past Neptune. • William Herschel discovered Uranus in 1781 by accident. • After 50 years it was seen to deviate fro ...
Chapter 15 The Formation of Planetary Systems
... starts to collapse, the Sun forms at the center, residual gas and dust remain in a rotating disk. Dust particles act as accretion nuclei to form the planets, by sticky collisions with other dust particles. •! Rocky planets would form close to the Sun; outer planets contain icy materials that would v ...
... starts to collapse, the Sun forms at the center, residual gas and dust remain in a rotating disk. Dust particles act as accretion nuclei to form the planets, by sticky collisions with other dust particles. •! Rocky planets would form close to the Sun; outer planets contain icy materials that would v ...
Chapter 15 The Formation of Planetary Systems
... starts to collapse, the Sun forms at the center, residual gas and dust remain in a rotating disk. Dust particles act as accretion nuclei to form the planets, by sticky collisions with other dust particles. • Rocky planets would form close to the Sun; outer planets contain icy materials that would va ...
... starts to collapse, the Sun forms at the center, residual gas and dust remain in a rotating disk. Dust particles act as accretion nuclei to form the planets, by sticky collisions with other dust particles. • Rocky planets would form close to the Sun; outer planets contain icy materials that would va ...
Lecture03
... Earth’s rotation • Responsible for our familiar calendar “day”. • Period (of rotation) = 24 hours = (24 hours)x(60 min/hr)x(60s/min) =86,400 s • Astronomers refer to this 24 hour period as a mean solar day (§2-7), implying that this time period is measured with respect to the Sun’s position on the ...
... Earth’s rotation • Responsible for our familiar calendar “day”. • Period (of rotation) = 24 hours = (24 hours)x(60 min/hr)x(60s/min) =86,400 s • Astronomers refer to this 24 hour period as a mean solar day (§2-7), implying that this time period is measured with respect to the Sun’s position on the ...
Lecture 4
... The solar system is divided into two major regions. 1. The Inner Solar System - Composed of the Sun, Mercury, Venus, Earth, Mars, and the Asteroid Belt. 2. The Outer Solar System - The Jovian or Gas Giant planets (Jupiter, Saturn, Uranus, and Neptune) with the Kuiper Belt and its objects. ...
... The solar system is divided into two major regions. 1. The Inner Solar System - Composed of the Sun, Mercury, Venus, Earth, Mars, and the Asteroid Belt. 2. The Outer Solar System - The Jovian or Gas Giant planets (Jupiter, Saturn, Uranus, and Neptune) with the Kuiper Belt and its objects. ...
From Dust to Planets - International Space Science Institute
... first (Figure 8). It is therefore important that the seed body reaches critical mass rapidly hence relatively high surface densities of solids are required. This explains why giant planets were believed to form only sufficiently far away from the star where ices and not just silicates are present. ...
... first (Figure 8). It is therefore important that the seed body reaches critical mass rapidly hence relatively high surface densities of solids are required. This explains why giant planets were believed to form only sufficiently far away from the star where ices and not just silicates are present. ...
The Physics of the Sun
... The equatorial coordinate system is used to illustrate the motion of heavenly stars on the celestial sphere—an imaginary sphere of radius equal to the distance of stars so that they appear to be lying on its surface. The projection of the earth’s equator onto the celestial sphere is called the celes ...
... The equatorial coordinate system is used to illustrate the motion of heavenly stars on the celestial sphere—an imaginary sphere of radius equal to the distance of stars so that they appear to be lying on its surface. The projection of the earth’s equator onto the celestial sphere is called the celes ...
Quiz 3
... • What is a sidereal day and and solar day? 1. A sidereal day is the amount of time it takes the sun to repeat its position in the sky. A solar day is the amount of time it takes for a star to repeat its position in the sky. 2. A solar day is the length of the day at the Tropic of Capricorn at solst ...
... • What is a sidereal day and and solar day? 1. A sidereal day is the amount of time it takes the sun to repeat its position in the sky. A solar day is the amount of time it takes for a star to repeat its position in the sky. 2. A solar day is the length of the day at the Tropic of Capricorn at solst ...
Our Place in the Cosmos Elective Course Autumn 2006
... backwards • In the same way, light from a distant star appears to be coming from a slightly different direction due to Earth’s motion through space • Over the course of a year stars appear to trace out a loop - aberration of starlight ...
... backwards • In the same way, light from a distant star appears to be coming from a slightly different direction due to Earth’s motion through space • Over the course of a year stars appear to trace out a loop - aberration of starlight ...
Orbits - davis.k12.ut.us
... three different, but equal, time periods. (Imagine each of these three samples to be the change in position of a planet after, say, one week.) Near aphelion the distance between the two positions is very small, but they are far from the Sun so a long, thin triangle is produced. At perihelion the pla ...
... three different, but equal, time periods. (Imagine each of these three samples to be the change in position of a planet after, say, one week.) Near aphelion the distance between the two positions is very small, but they are far from the Sun so a long, thin triangle is produced. At perihelion the pla ...
doc - Discover Earth Science
... 2. December 21 - Winter Solstice - 1st full day of winter - date usually is the 21st a. the direct rays of the Sun land on the Tropic of Capricorn at solar noon b. in New York State we have about 8 hours of daylight, 16 of darkness c. in New York State, Sunrise is most south of east, Sunset most sou ...
... 2. December 21 - Winter Solstice - 1st full day of winter - date usually is the 21st a. the direct rays of the Sun land on the Tropic of Capricorn at solar noon b. in New York State we have about 8 hours of daylight, 16 of darkness c. in New York State, Sunrise is most south of east, Sunset most sou ...
Exploration of the Kuiper Belt by High-Precision Photometric
... Fresnel scale, the diameter of the diffracting shadow does not depend on the object’s size and is proportional to the Fresnel scale. On the other hand, the duration of an occultation is directly related to the distance of the object from the Sun (Kepler’s Third Law). Assuming a circular orbit and ze ...
... Fresnel scale, the diameter of the diffracting shadow does not depend on the object’s size and is proportional to the Fresnel scale. On the other hand, the duration of an occultation is directly related to the distance of the object from the Sun (Kepler’s Third Law). Assuming a circular orbit and ze ...
geol0810 homework 1: early solar system history
... energy released by the decay of a 26Al atom to a 26Mg atom provided a potent source of heat during the first few million years of Solar System history. The radioactive decay of 26Al to form 26Mg releases so much heat that asteroid-sized bodies would have melted (and thus allow for differentiation) i ...
... energy released by the decay of a 26Al atom to a 26Mg atom provided a potent source of heat during the first few million years of Solar System history. The radioactive decay of 26Al to form 26Mg releases so much heat that asteroid-sized bodies would have melted (and thus allow for differentiation) i ...
but restricted to nearby large stars
... Also, the physical properties that control motions of material and the temperatures encountered are far different in the Sun's atmosphere than in the layers of the Sun beneath the photosphere. ...
... Also, the physical properties that control motions of material and the temperatures encountered are far different in the Sun's atmosphere than in the layers of the Sun beneath the photosphere. ...
Astronomy Exam #2 for the 10
... and cool giant stars. The hot main sequence stars appear to be mostly B and A spectral type with an absolute magnitude between +2 and -5. This range in absolute magnitudes corresponds to a range in luminosity of between 16 and 10,000 solar luminosities. These stars will have a short main sequence li ...
... and cool giant stars. The hot main sequence stars appear to be mostly B and A spectral type with an absolute magnitude between +2 and -5. This range in absolute magnitudes corresponds to a range in luminosity of between 16 and 10,000 solar luminosities. These stars will have a short main sequence li ...
The Solar System and Beyond
... The average distance between the Earth and Sun is called an Astronomical Unit or AU. In the meter stick model, one AU is one inch. There are about 63,240 AU in one light-year. There are 63,360 inches in one mile. Because these are almost the same, we can extend our meter stick model solar system to ...
... The average distance between the Earth and Sun is called an Astronomical Unit or AU. In the meter stick model, one AU is one inch. There are about 63,240 AU in one light-year. There are 63,360 inches in one mile. Because these are almost the same, we can extend our meter stick model solar system to ...
Comets, the Kuiper Belt and the Oort Cloud
... some even icy dirt balls (Hartnett, 2006). They travel into the inner solar system displaying, in some cases spectacularly, their long tails, which comprise escaping gas and dust, the result of ices sublimating1 from their icy surface. This display gets stronger as they approach the sun, where the s ...
... some even icy dirt balls (Hartnett, 2006). They travel into the inner solar system displaying, in some cases spectacularly, their long tails, which comprise escaping gas and dust, the result of ices sublimating1 from their icy surface. This display gets stronger as they approach the sun, where the s ...
Earth moves faster in its orbit.
... The geocentric model was supported by Aristotle because of which of the following? a) b) c) d) e) ...
... The geocentric model was supported by Aristotle because of which of the following? a) b) c) d) e) ...
Our solar system
... • Solar system consists of Sun and everything orbiting it. • Asteroids are rocky, and most orbit between orbits of Mars and Jupiter. • Comets are icy, and are believed to have formed early in the solar system’s life. • Major planets orbit Sun in same sense, and all but Venus rotate in that sense as ...
... • Solar system consists of Sun and everything orbiting it. • Asteroids are rocky, and most orbit between orbits of Mars and Jupiter. • Comets are icy, and are believed to have formed early in the solar system’s life. • Major planets orbit Sun in same sense, and all but Venus rotate in that sense as ...
Solar System
The Solar System comprises the Sun and the planetary system that orbits it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies such as comets and asteroids. Of those that orbit the Sun indirectly, two are larger than the smallest planet.The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed largely of substances with relatively high melting points compared with hydrogen and helium, called ices, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.The Solar System also contains smaller objects. The asteroid belt, which lies between Mars and Jupiter, mostly contains objects composed, like the terrestrial planets, of rock and metal. Beyond Neptune's orbit lie the Kuiper belt and scattered disc, populations of trans-Neptunian objects composed mostly of ices, and beyond them a newly discovered population of sednoids. Within these populations are several dozen to possibly tens of thousands of objects large enough to have been rounded by their own gravity. Such objects are categorized as dwarf planets. Identified dwarf planets include the asteroid Ceres and the trans-Neptunian objects Pluto and Eris. In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust, freely travel between regions. Six of the planets, at least three of the dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed ""moons"" after the Moon. Each of the outer planets is encircled by planetary rings of dust and other small objects.The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region in the interstellar medium known as the heliosphere. The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of interstellar wind; it extends out to the edge of the scattered disc. The Oort cloud, which is believed to be the source for long-period comets, may also exist at a distance roughly a thousand times further than the heliosphere. The Solar System is located in the Orion Arm, 26,000 light-years from the center of the Milky Way.