Introduction to Astronomy
... Gravity is the glue that keeps the entire Universe together. It is a force of attraction that binds particles together to form atoms and so on, up the scale to the mass of the Universe itself. The greater the cumulative mass, the greater the attracting power. Gravity attraction can be mutual. The gr ...
... Gravity is the glue that keeps the entire Universe together. It is a force of attraction that binds particles together to form atoms and so on, up the scale to the mass of the Universe itself. The greater the cumulative mass, the greater the attracting power. Gravity attraction can be mutual. The gr ...
The Origin of Comets and the Oort Cloud
... Thus, on a Bablyonian tablet dated around 1140 BC and referring to a military campaign, we read: “a comet arose whose body was bright like the day, while from its luminous body a tail extended, like the sting of a scorpion.” And in Diodorus Siculus’s account of the expedition of Timoleon (344 BC): “ ...
... Thus, on a Bablyonian tablet dated around 1140 BC and referring to a military campaign, we read: “a comet arose whose body was bright like the day, while from its luminous body a tail extended, like the sting of a scorpion.” And in Diodorus Siculus’s account of the expedition of Timoleon (344 BC): “ ...
Century-Long Monitoring of Solar Irradiance and Earth`s Albedo
... LEO (Dever et al. 2012, Table 4). To achieve an albedo stability over a century, GeoSphere’s surface should be a simple metal, alloy, or crystalline material not susceptible to such changes, like telescope optics in space. Such substances would need testing before launch, and perhaps “pre-aged” by d ...
... LEO (Dever et al. 2012, Table 4). To achieve an albedo stability over a century, GeoSphere’s surface should be a simple metal, alloy, or crystalline material not susceptible to such changes, like telescope optics in space. Such substances would need testing before launch, and perhaps “pre-aged” by d ...
photosphere
... Which transitions were responsible for each of these absorption lines? a) A: 1-2 B: 2-4 C: 1-4 b) A: 1-4 B: 2-4 C: 1-2 c) A: 4-1 B: 4-2 C: 2-1 ...
... Which transitions were responsible for each of these absorption lines? a) A: 1-2 B: 2-4 C: 1-4 b) A: 1-4 B: 2-4 C: 1-2 c) A: 4-1 B: 4-2 C: 2-1 ...
New Light on the Solar System
... LET’S TALK FOR A MOMENT about our immediate neighborhood. A radio signal sweeps from Earth to the moon in just over one and a quarter seconds and from Earth to Mars in as little as three minutes. Even Pluto is only about six hours away at light speed; if you packed a lunch and caught a round-trip su ...
... LET’S TALK FOR A MOMENT about our immediate neighborhood. A radio signal sweeps from Earth to the moon in just over one and a quarter seconds and from Earth to Mars in as little as three minutes. Even Pluto is only about six hours away at light speed; if you packed a lunch and caught a round-trip su ...
Jupiter – Friend or Foe? IV:The influence of orbital eccentricity and
... Pepe et al., 2004, Moutou et al., 2009, Mordasini et al., 2011) and the Anglo-Australian Search for Planets (e.g. Jones et al., 2002, O’Toole et al., 2009, Tinney et al., 2011) have found the great majority of known planets, but to date, no ground based technique has been capable of finding truly Ea ...
... Pepe et al., 2004, Moutou et al., 2009, Mordasini et al., 2011) and the Anglo-Australian Search for Planets (e.g. Jones et al., 2002, O’Toole et al., 2009, Tinney et al., 2011) have found the great majority of known planets, but to date, no ground based technique has been capable of finding truly Ea ...
Kepler Mission Workshop Presentation
... The photometer is composed of just one "instrument," which is, an array of 42 CCDs (charge coupled devices). Each 50x25 mm CCD has 2200x1024 pixels. The CCDs are not used to take pictures. The images are intentionally defocused to improve the photometric precision. ...
... The photometer is composed of just one "instrument," which is, an array of 42 CCDs (charge coupled devices). Each 50x25 mm CCD has 2200x1024 pixels. The CCDs are not used to take pictures. The images are intentionally defocused to improve the photometric precision. ...
Physical structure of the local interstellar medium
... supported by the solar wind. The boundary of the heliosphere is determined by the location where the pressure of the expanding solar wind precisely balances the ambient pressure of the local interstellar medium (LISM). Just beyond the heliosphere lies warm partially ionized interstellar gas, with a ...
... supported by the solar wind. The boundary of the heliosphere is determined by the location where the pressure of the expanding solar wind precisely balances the ambient pressure of the local interstellar medium (LISM). Just beyond the heliosphere lies warm partially ionized interstellar gas, with a ...
Part 3
... Therefore, the overlap of the Aquarius and Leo signs of the Tropical and Solar System Zodiacs (Fig.3) resembles two sets of filters (when filters coincide in “colour”, the might of the passed stream is the highest). This becomes a significant factor in supporting the developed model of the SSZ, beca ...
... Therefore, the overlap of the Aquarius and Leo signs of the Tropical and Solar System Zodiacs (Fig.3) resembles two sets of filters (when filters coincide in “colour”, the might of the passed stream is the highest). This becomes a significant factor in supporting the developed model of the SSZ, beca ...
Uncovering Student Ideas in Science
... S6E3. Students will recognize the significant role of water in earth processes. a. Explain that a large portion of the Earth’s surface is water, consisting of oceans, rivers, lakes, underground water, and ice. b. Relate various atmospheric conditions to stages of the water cycle. c. Describe the com ...
... S6E3. Students will recognize the significant role of water in earth processes. a. Explain that a large portion of the Earth’s surface is water, consisting of oceans, rivers, lakes, underground water, and ice. b. Relate various atmospheric conditions to stages of the water cycle. c. Describe the com ...
Asteroids and Comets and Meteors, Oh My!
... sky; you would have to watch one for hours or days to see its movement. The center of a comet is a ball of frozen gas, dust, and water. Like planets or moons, comets orbit around the Sun. The comet that causes the Leonids is called Tempel-Tuttle. It is named after two scientists who discovered it at ...
... sky; you would have to watch one for hours or days to see its movement. The center of a comet is a ball of frozen gas, dust, and water. Like planets or moons, comets orbit around the Sun. The comet that causes the Leonids is called Tempel-Tuttle. It is named after two scientists who discovered it at ...
Sidereal Time Distribution in Large-Scale of Orbits
... (the upper meridian) in the sky[6]. Solar time is what the time we all use where a day is defined as 24 hours, which is the average time that it takes for the sun to return to its highest point, see figure 1. ...
... (the upper meridian) in the sky[6]. Solar time is what the time we all use where a day is defined as 24 hours, which is the average time that it takes for the sun to return to its highest point, see figure 1. ...
Analytic Models for the Mechanical Structure of the Solar Core
... In the homogeneous ZAMS Sun, 1 + ne ≡ d ln P/d ln(P/ρ) is identical to 1 + N ≡ d ln P/d ln T ≡ 1/∇ and varies from the almost adiabatic value 2.52 at z = 0 to a maximum value 5.21 at z = 0.32 (r = 0.506 of ZAMS solar radius). Where the radiative zone meets the convective core, 1 + ne shows a discont ...
... In the homogeneous ZAMS Sun, 1 + ne ≡ d ln P/d ln(P/ρ) is identical to 1 + N ≡ d ln P/d ln T ≡ 1/∇ and varies from the almost adiabatic value 2.52 at z = 0 to a maximum value 5.21 at z = 0.32 (r = 0.506 of ZAMS solar radius). Where the radiative zone meets the convective core, 1 + ne shows a discont ...
Solar Orbiter
... the Sun’s magnetised atmosphere, using close-up, high-resolution remote sensing identify the links between activity on the Sun’s surface and the resulting evolution of the corona and inner heliosphere, using solar co-rotating passes observe and fully characterise the Sun’s polar regions and equa ...
... the Sun’s magnetised atmosphere, using close-up, high-resolution remote sensing identify the links between activity on the Sun’s surface and the resulting evolution of the corona and inner heliosphere, using solar co-rotating passes observe and fully characterise the Sun’s polar regions and equa ...
Exercise 7.0
... attention to the changing places on the horizon where the Sun rises and sets as the seasons advance. Also note that the upper and lower transit points for the Sun change. Now do the same thing for latitude 60o and also 20o in order to study the differences in the Sun's motion for different places on ...
... attention to the changing places on the horizon where the Sun rises and sets as the seasons advance. Also note that the upper and lower transit points for the Sun change. Now do the same thing for latitude 60o and also 20o in order to study the differences in the Sun's motion for different places on ...
Locating Geographic Coordinates Using Observations over the Sun
... find out how the knowledge about the Earth’s rotation, its revolution around the Sun, and the Earth’s position relative to the Polaris star can be applied for the practical purpose of determining the coordinates of the observer on Earth. The main priority in the essay is given to discussion of the o ...
... find out how the knowledge about the Earth’s rotation, its revolution around the Sun, and the Earth’s position relative to the Polaris star can be applied for the practical purpose of determining the coordinates of the observer on Earth. The main priority in the essay is given to discussion of the o ...
PTYS/ASTR 206
... cleared the neighbourhood around its orbit. • (2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourh ...
... cleared the neighbourhood around its orbit. • (2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighbourh ...
The Solar System and Beyond
... Seasons Who doesn’t love summer? The long, warm days are great for swimming, biking, and relaxing. Why can’t summer last all year? Blame it on Earth’s axis and revolution around the Sun. The axis is not straight up and down like a skyscraper—it is slightly tilted. It’s because of this tilt and Earth ...
... Seasons Who doesn’t love summer? The long, warm days are great for swimming, biking, and relaxing. Why can’t summer last all year? Blame it on Earth’s axis and revolution around the Sun. The axis is not straight up and down like a skyscraper—it is slightly tilted. It’s because of this tilt and Earth ...
Variability of solar/stellar activity and magnetic field and its influence... planetary atmosphere evolution
... magnetic dynamo that is more efficient than that of the present-day Sun. This results in stronger surface magnetic fields and/or higher surface magnetic filling factors which induce enhanced “activity” in all its variations, from larger surface spots to stronger, extended solar wind. • The optical a ...
... magnetic dynamo that is more efficient than that of the present-day Sun. This results in stronger surface magnetic fields and/or higher surface magnetic filling factors which induce enhanced “activity” in all its variations, from larger surface spots to stronger, extended solar wind. • The optical a ...
pdf - at www.arxiv.org.
... macroscopic chaos in planetary-sized bodies can be seen after several million years (Laskar, 1994). Charvátová through these qualitative similarities in SIM and sunspot series related to GM, especially DM, hypothesized that an imminent new GM event might occur after the cycle 22. ...
... macroscopic chaos in planetary-sized bodies can be seen after several million years (Laskar, 1994). Charvátová through these qualitative similarities in SIM and sunspot series related to GM, especially DM, hypothesized that an imminent new GM event might occur after the cycle 22. ...
Astronomy and the Coal Age of Alabama
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
Compartive Planetology I: Our Solar. System
... vian planets would be futile, because the materials of which these planets are made are mostly gaseous or liquid. The visible “surface” features of a Jovian planet are actually cloud forma— tions in the planet’s atmosphere. The photographs in Figure 7-2 show the distinctive appearances of the two cl ...
... vian planets would be futile, because the materials of which these planets are made are mostly gaseous or liquid. The visible “surface” features of a Jovian planet are actually cloud forma— tions in the planet’s atmosphere. The photographs in Figure 7-2 show the distinctive appearances of the two cl ...
Stellar Evolution Task
... and a beautiful symetric nebula. It looks like a ring since the mass the star has lost is in a spherical shell around it. ...
... and a beautiful symetric nebula. It looks like a ring since the mass the star has lost is in a spherical shell around it. ...
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 ...
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.