The Oort Cloud
... years, our knowledge of it is fairly recent. In 1950 the Dutch astronomer Jan Hendrik Oort noted that the orbits of most observed comets are shaped like extremely elongated ellipses. They approach the sun at the very edge of their orbits, and then take off again to distances as much as a hundred tho ...
... years, our knowledge of it is fairly recent. In 1950 the Dutch astronomer Jan Hendrik Oort noted that the orbits of most observed comets are shaped like extremely elongated ellipses. They approach the sun at the very edge of their orbits, and then take off again to distances as much as a hundred tho ...
Powerpoint slides - UCLA - Earth, Planetary, and Space Sciences
... • Early stages of solar system formation can be imaged directly – dust disks have large surface area, radiate effectively in the infra-red • Unfortunately, once planets form, the IR signal disappears, so until very recently we couldn’t detect planets (see later) • Timescale of clearing of nebula (~1 ...
... • Early stages of solar system formation can be imaged directly – dust disks have large surface area, radiate effectively in the infra-red • Unfortunately, once planets form, the IR signal disappears, so until very recently we couldn’t detect planets (see later) • Timescale of clearing of nebula (~1 ...
PHYSICAL SCIENCE STUDY GUIDE CHAPTER 10: 1. What are the
... 5. Name the terrestrial planets and the jovian planets and compare the terrestrial planets with the Jovian planets in terms of size, composition and density. 6. What proofs are there that the Earth is round, is rotating and is revolving around the sun? 7. Describe the planets Mercury, Venus and Mar ...
... 5. Name the terrestrial planets and the jovian planets and compare the terrestrial planets with the Jovian planets in terms of size, composition and density. 6. What proofs are there that the Earth is round, is rotating and is revolving around the sun? 7. Describe the planets Mercury, Venus and Mar ...
Terrestrial Planets
... gravitational influence of a foreground star. The light curve shape is sensitive to whether the lensing star is a single star or a binary (star + planet is a special case of the binary) • Rare - requires monitoring millions of background stars, and also unrepeatable • Some sensitivity to Earth mass ...
... gravitational influence of a foreground star. The light curve shape is sensitive to whether the lensing star is a single star or a binary (star + planet is a special case of the binary) • Rare - requires monitoring millions of background stars, and also unrepeatable • Some sensitivity to Earth mass ...
Lesson 3: The Motion of the Moon, Sun, and Stars— Motivating
... lesson when the ancient measurements are related to the triangle trigonometry that students saw in high school Geometry, which leads into the formal definitions of these functions in the next lesson. Throughout this lesson, refer to the functions that became the sine and cosine functions using their ...
... lesson when the ancient measurements are related to the triangle trigonometry that students saw in high school Geometry, which leads into the formal definitions of these functions in the next lesson. Throughout this lesson, refer to the functions that became the sine and cosine functions using their ...
What causes the moon to change in appearance
... Doesn’t it seem as if the moon’s shape changes night after night? As the moon orbits –the curved path of a celestial object or spacecraft around a star or planet—Earth, it appears as though the moon is changing its shape in the sky. This is because as the moon changes its position, the amount of sun ...
... Doesn’t it seem as if the moon’s shape changes night after night? As the moon orbits –the curved path of a celestial object or spacecraft around a star or planet—Earth, it appears as though the moon is changing its shape in the sky. This is because as the moon changes its position, the amount of sun ...
THE EARTH AND THE UNIVERSE
... The earthview control shows the moon seen from the earth when it is set to yes, and it allows you to see eclipses when it is set to watch eclipses. The rise and tilt control allows you to see the system from a different point of view. The speed control allows you to set the speed of the simulati ...
... The earthview control shows the moon seen from the earth when it is set to yes, and it allows you to see eclipses when it is set to watch eclipses. The rise and tilt control allows you to see the system from a different point of view. The speed control allows you to set the speed of the simulati ...
Surface reflectance properties of distant Solar system bodies
... many of the possible objects identified were not just noise, but were likely to be Halley-sized (i.e. ~ 10 kIn) KBOs (although no one object could be confirmed as being 'real'). This suggests that there must be > 2 x 108 objects with diameters> 10 kIn in the Kuiper Belt with inclinations <120 and wi ...
... many of the possible objects identified were not just noise, but were likely to be Halley-sized (i.e. ~ 10 kIn) KBOs (although no one object could be confirmed as being 'real'). This suggests that there must be > 2 x 108 objects with diameters> 10 kIn in the Kuiper Belt with inclinations <120 and wi ...
Solution
... the red one must be smaller. But by Stefan-Boltzmann's Law, its luminosity/area must also be smaller, and they are the same size. So the red one is less luminous. 3. ( T F ) Using parallax, astronomers can now reliably measure the distance of most of the stars in our galaxy. False. Sad to say, most ...
... the red one must be smaller. But by Stefan-Boltzmann's Law, its luminosity/area must also be smaller, and they are the same size. So the red one is less luminous. 3. ( T F ) Using parallax, astronomers can now reliably measure the distance of most of the stars in our galaxy. False. Sad to say, most ...
Insights into Bode`s Law
... The matters might have stood there if not for the fact that this object was located at the heliocentric distance as predicted by Bode’s Law. Titus and Bode believed that Piazzi had found and then lost the planet. Thus both Titus and Bode make used of the discovery made by Piazzi and embarked on a jo ...
... The matters might have stood there if not for the fact that this object was located at the heliocentric distance as predicted by Bode’s Law. Titus and Bode believed that Piazzi had found and then lost the planet. Thus both Titus and Bode make used of the discovery made by Piazzi and embarked on a jo ...
Slide 1
... match the current luminosity and radius of the Sun One input to models is ratio of mass fraction of H ( = X) to mass fraction of heavy elements (= Z) Mass fraction of He ( = Y) follows from X + Y + Z = 1 Z is the sum of the mass fraction of all elements heavier than He (the “metals”) Z is dominated ...
... match the current luminosity and radius of the Sun One input to models is ratio of mass fraction of H ( = X) to mass fraction of heavy elements (= Z) Mass fraction of He ( = Y) follows from X + Y + Z = 1 Z is the sum of the mass fraction of all elements heavier than He (the “metals”) Z is dominated ...
Information extracted from Britannica 97
... The detection of methane ice on the planet's surface made scientists confident that Pluto had an atmosphere before one was actually discovered. The atmosphere was finally detected in 1988 when Pluto passed in front of a star as observed from the Earth. The light of the star was dimmed before disappe ...
... The detection of methane ice on the planet's surface made scientists confident that Pluto had an atmosphere before one was actually discovered. The atmosphere was finally detected in 1988 when Pluto passed in front of a star as observed from the Earth. The light of the star was dimmed before disappe ...
answer
... of our discussion of nuclear fusion and nuclear fission reactions? ANS: Chemical elements that are lighter than the “iron-nickel group” of elements will usually release energy when they participate in a fusion reaction, whereas chemical elements that are heavier than the “iron-nickel group” will usu ...
... of our discussion of nuclear fusion and nuclear fission reactions? ANS: Chemical elements that are lighter than the “iron-nickel group” of elements will usually release energy when they participate in a fusion reaction, whereas chemical elements that are heavier than the “iron-nickel group” will usu ...
Geometry of orbits - Harpursville Middle School
... Chunks of rock and metal that circle the sun Range in size from hundreds of km to mm Most are in a belt between Mars and Jupiter Rarely cross Earth’s orbit May have caused the extinction of dinosaurs ...
... Chunks of rock and metal that circle the sun Range in size from hundreds of km to mm Most are in a belt between Mars and Jupiter Rarely cross Earth’s orbit May have caused the extinction of dinosaurs ...
unit 23 - Institute for School Partnership
... When you get to these websites, you will have to put in the correct month, day and/or year. Ideally, students should work in groups with a computer to research the time of sunset and sunrise on each of their birthdays. If computer access is a problem, you can visit this website: http://aa.usno.navy. ...
... When you get to these websites, you will have to put in the correct month, day and/or year. Ideally, students should work in groups with a computer to research the time of sunset and sunrise on each of their birthdays. If computer access is a problem, you can visit this website: http://aa.usno.navy. ...
The Solar System - MrCrabtreesScience
... • The largest of the planets (88,700km wide) • Is comprised almost entirely of hydrogen and helium. If it were considerably larger, it could have become a star. • The gas is compressed to a liquid in the center. • There is likely a molten rocky core, possibly from impacts with other objects. • Surfa ...
... • The largest of the planets (88,700km wide) • Is comprised almost entirely of hydrogen and helium. If it were considerably larger, it could have become a star. • The gas is compressed to a liquid in the center. • There is likely a molten rocky core, possibly from impacts with other objects. • Surfa ...
Powerpoint slides - Earth & Planetary Sciences
... • Hypothesis 1) can’t explain why the gas/ice giants are so different to the original nebular composition, and require an enormous initial nebula mass (~1 solar mass) • Hypothesis 2) is reasonable, and can explain why Uranus and Neptune are smaller with less H/He – they must have been forming as the ...
... • Hypothesis 1) can’t explain why the gas/ice giants are so different to the original nebular composition, and require an enormous initial nebula mass (~1 solar mass) • Hypothesis 2) is reasonable, and can explain why Uranus and Neptune are smaller with less H/He – they must have been forming as the ...
If you weighed 100 lbs on Earth, you would weigh 38 pounds on
... ~ Mars has permanent ice caps at both poles made up mostly of solid carbon dioxide. We know this as "dry ice." ~ Very strong winds and vast dust storms sometimes blow through the entire planet for months! ~ Mars has two tiny moons which orbit very close to the surface. Their names are Phobos and Dei ...
... ~ Mars has permanent ice caps at both poles made up mostly of solid carbon dioxide. We know this as "dry ice." ~ Very strong winds and vast dust storms sometimes blow through the entire planet for months! ~ Mars has two tiny moons which orbit very close to the surface. Their names are Phobos and Dei ...
2.4 Statistical properties of radial velocity planets
... planets for the surveyed stars. Giant planets around late type stars. For giant planets around single late type F, G, K main-sequence stars the RV velocity surveys find the following numbers: – for about 1 % of the stars a close in (<0.1 AU), hot Jupiter with mP sin i > 0.1MJ is detected, – for abou ...
... planets for the surveyed stars. Giant planets around late type stars. For giant planets around single late type F, G, K main-sequence stars the RV velocity surveys find the following numbers: – for about 1 % of the stars a close in (<0.1 AU), hot Jupiter with mP sin i > 0.1MJ is detected, – for abou ...
The Sun`s journey through the local interstellar medium: the
... decrease by ≥20% from the cloud exterior to the solar location.2 In contrast, He and Ne ionizations, which require photons more energetic by > 50%, vary little. Guesstimates indicate that for ∼ 50% filtration of Ho , converting 20% of the H from Ho to H+ would raise the H pressure confining the pale ...
... decrease by ≥20% from the cloud exterior to the solar location.2 In contrast, He and Ne ionizations, which require photons more energetic by > 50%, vary little. Guesstimates indicate that for ∼ 50% filtration of Ho , converting 20% of the H from Ho to H+ would raise the H pressure confining the pale ...
Letter of Intent for submission of a Mission Proposal for a Flexi
... structure of such phenomena at the coronal base will for the first time be measured at very high spatial (< 100 km) and temporal (< 1 s) resolution. SO will for the first time image directly the polar regions, where the fast solar wind is formed, from an out-of-ecliptic position (with inclinations r ...
... structure of such phenomena at the coronal base will for the first time be measured at very high spatial (< 100 km) and temporal (< 1 s) resolution. SO will for the first time image directly the polar regions, where the fast solar wind is formed, from an out-of-ecliptic position (with inclinations r ...
File - Adriana Romo
... Interviewer: How did the white dwarf get its name? Scientist: They got their name because of the white color of the first few white dwarfs discovered. Interviewer: How are white dwarfs characterized? Scientist: They are characterized by a low luminosity, a mass close to that of our sun,and radius o ...
... Interviewer: How did the white dwarf get its name? Scientist: They got their name because of the white color of the first few white dwarfs discovered. Interviewer: How are white dwarfs characterized? Scientist: They are characterized by a low luminosity, a mass close to that of our sun,and radius o ...
What makes a planet habitable?
... 20EUV (4.13 Gyr ago): subsolar obstacle distance 12.7REarth N+ion pick up loss rate ~2 ×1030 s-1 Total loss of nitrogen would result in an equivalent amount of ≤ 20 bar during ~ 50 Myr Simulations indicate that the atmosphere should have been protected more efficiently most likely due to higher carb ...
... 20EUV (4.13 Gyr ago): subsolar obstacle distance 12.7REarth N+ion pick up loss rate ~2 ×1030 s-1 Total loss of nitrogen would result in an equivalent amount of ≤ 20 bar during ~ 50 Myr Simulations indicate that the atmosphere should have been protected more efficiently most likely due to higher carb ...
(Preprint) AAS 11-665 - Long Now > Media > Uploader
... ever in a state many minutes or hours from the correct local apparent solar time, it may take multiple sunny days to correct itself. Because the correction may be negative, Corrected Solar Time as generated is not monotonic; it can go backwards, repeating a short interval of time. To prevent the me ...
... ever in a state many minutes or hours from the correct local apparent solar time, it may take multiple sunny days to correct itself. Because the correction may be negative, Corrected Solar Time as generated is not monotonic; it can go backwards, repeating a short interval of time. To prevent the me ...
Asteroids, Comets & Meteors Teacher's Guide
... as they fall through Earth’s upper atmosphere. 99.9% of all meteors seen are very small rocks no larger than single grains of sand or even specks of dust. The small particles are often the remains of dust and pebbles released from comets. The 0.1% remaining meteors are often larger and burn much bri ...
... as they fall through Earth’s upper atmosphere. 99.9% of all meteors seen are very small rocks no larger than single grains of sand or even specks of dust. The small particles are often the remains of dust and pebbles released from comets. The 0.1% remaining meteors are often larger and burn much bri ...
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.