
The Human Orrery - Armagh Observatory
... Lots of examples, e.g. How fast does Saturn move in its orbit around the Sun? 1. Saturn travels ≈1 metre on the ground in 160 days. � That is, ≈ 1.5 × 1011 m in space in 160 days. � i.e. ≈ 1.5 × 108 km in half a year, which is roughly 1.5 × 107 seconds. 2. So Saturn moves at approximately 10 km s−1 ...
... Lots of examples, e.g. How fast does Saturn move in its orbit around the Sun? 1. Saturn travels ≈1 metre on the ground in 160 days. � That is, ≈ 1.5 × 1011 m in space in 160 days. � i.e. ≈ 1.5 × 108 km in half a year, which is roughly 1.5 × 107 seconds. 2. So Saturn moves at approximately 10 km s−1 ...
Astonomy-Space The Final Frontier
... Explain how Kepler’s laws allow us to construct a scale model of the solar system, and explain the technique used to determine the actual size of the planetary orbits. Be able to state Newton’s laws of gravitation and explain how they account for Kepler’s laws. Explain how the law of gravitati ...
... Explain how Kepler’s laws allow us to construct a scale model of the solar system, and explain the technique used to determine the actual size of the planetary orbits. Be able to state Newton’s laws of gravitation and explain how they account for Kepler’s laws. Explain how the law of gravitati ...
Constraints on the Birth Aggregate of the Solar System
... For completeness, we note that thermally pulsing asymptotic giant branch stars have also been suggested as an enrichment source (see Brusso, Gallino, and Wasserburg 1999), but the probability that such a star is associated with a molecular cloud is relatively low (Kastner and Myers 1994). We also kn ...
... For completeness, we note that thermally pulsing asymptotic giant branch stars have also been suggested as an enrichment source (see Brusso, Gallino, and Wasserburg 1999), but the probability that such a star is associated with a molecular cloud is relatively low (Kastner and Myers 1994). We also kn ...
SPIRou Science Case
... habitable zones (HZs) of their host stars, i.e., in the orbital range where liquid water can be stable at the planetary surfaces. Identifying habitable Earth-like planets and searching for biomarkers in their atmospheres is among the main objectives of this new century’s astronomy, motivating ambiti ...
... habitable zones (HZs) of their host stars, i.e., in the orbital range where liquid water can be stable at the planetary surfaces. Identifying habitable Earth-like planets and searching for biomarkers in their atmospheres is among the main objectives of this new century’s astronomy, motivating ambiti ...
- Interactive Media Systems, TU Vienna
... lters which are oriented so that they can separate the images, so that each eye receives only the one image intended for it. A special screen is necessary that preserves the polarization of the light, especially for the recommended back projection setup that avoids problems with shadows. One advant ...
... lters which are oriented so that they can separate the images, so that each eye receives only the one image intended for it. A special screen is necessary that preserves the polarization of the light, especially for the recommended back projection setup that avoids problems with shadows. One advant ...
File
... Two major theories about the origin of the Universe are the Big Bang and the Steady State theories. Some evidence supports both theories. Other evidence supports only one theory. By considering the evidence, discuss why one of these theories is preferred by most scientists. ...
... Two major theories about the origin of the Universe are the Big Bang and the Steady State theories. Some evidence supports both theories. Other evidence supports only one theory. By considering the evidence, discuss why one of these theories is preferred by most scientists. ...
Our Local Group of Galaxies
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
Unravelling the Origin and Evolution of Our Galaxy
... In the past five years, a huge programme of high-precision ground-based radial velocity (Doppler) measurements has led to the detection of about 40 extra-solar planets surrounding stars other than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this metho ...
... In the past five years, a huge programme of high-precision ground-based radial velocity (Doppler) measurements has led to the detection of about 40 extra-solar planets surrounding stars other than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this metho ...
The Age and Progenitor Mass of Sirius B
... Binaries consisting of a nuclear-burning star and a white dwarf offer another potential source of candidates for the IFMR. If the parameters of the nuclear-burning star can be established with sufficient accuracy that its age can be obtained by fitting its position on the HR Diagram, then the total ...
... Binaries consisting of a nuclear-burning star and a white dwarf offer another potential source of candidates for the IFMR. If the parameters of the nuclear-burning star can be established with sufficient accuracy that its age can be obtained by fitting its position on the HR Diagram, then the total ...
Meteorites: Fragments of Asteroids
... Gradually, as more asteroids were discovered astronomers began to realize that they were simply bodies of subplanetary mass and size which, in their minds’ eyes gave asteroids a minor status among the Solar System’s much more massive planets. By the late nineteenth century many astronomers referred ...
... Gradually, as more asteroids were discovered astronomers began to realize that they were simply bodies of subplanetary mass and size which, in their minds’ eyes gave asteroids a minor status among the Solar System’s much more massive planets. By the late nineteenth century many astronomers referred ...
Evidence for the Tidal Destruction of Hot Jupiters by Subgiant Stars
... Figure 2. Galactic U V W kinematics of subgiant stars that host exoplanets discovered with the radial-velocity technique. In each panel, we plot the U V W space motions of the subgiant sample as blue points and the density of points in a control sample selected from the Hipparcos catalog as the back ...
... Figure 2. Galactic U V W kinematics of subgiant stars that host exoplanets discovered with the radial-velocity technique. In each panel, we plot the U V W space motions of the subgiant sample as blue points and the density of points in a control sample selected from the Hipparcos catalog as the back ...
Meteorites: Fragments of Asteroids - Beck-Shop
... Gradually, as more asteroids were discovered astronomers began to realize that they were simply bodies of subplanetary mass and size which, in their minds’ eyes gave asteroids a minor status among the Solar System’s much more massive planets. By the late nineteenth century many astronomers referred ...
... Gradually, as more asteroids were discovered astronomers began to realize that they were simply bodies of subplanetary mass and size which, in their minds’ eyes gave asteroids a minor status among the Solar System’s much more massive planets. By the late nineteenth century many astronomers referred ...
8-4.9 - S2TEM Centers SC
... All stars are the same size, and the same distance from the earth. The galaxy is very crowded. Stars are evenly distributed throughout the universe. The brightness of a star depends only on its distance from the earth. The North Star is the brightest star in the night sky. (Sirius is the b ...
... All stars are the same size, and the same distance from the earth. The galaxy is very crowded. Stars are evenly distributed throughout the universe. The brightness of a star depends only on its distance from the earth. The North Star is the brightest star in the night sky. (Sirius is the b ...
Saturn - Heroku
... about saturn by the free dictionary - saturn in astronomy 6th planet from the sun astronomical and physical characteristics of saturn saturn s orbit lies between those of jupiter and uranus its mean, cassini the grand finale overview - a short animated video describing cassini s grand finale downloa ...
... about saturn by the free dictionary - saturn in astronomy 6th planet from the sun astronomical and physical characteristics of saturn saturn s orbit lies between those of jupiter and uranus its mean, cassini the grand finale overview - a short animated video describing cassini s grand finale downloa ...
oC - Geogreenapps
... purchase the large maps, it is now issued with the large maps in miniature, interspersed among the leMOns. These being exact copies of the originals, though upon a smaller scale, we have not only a magnificent set of charts for lectures and illustrations in the school-room, but each learner has a se ...
... purchase the large maps, it is now issued with the large maps in miniature, interspersed among the leMOns. These being exact copies of the originals, though upon a smaller scale, we have not only a magnificent set of charts for lectures and illustrations in the school-room, but each learner has a se ...
M sin i
... The discovery of planets (particularly transits) forced to discuss the issue, because low mass objects have similar sizes. Planets are opaque bodies that reflect light from their parent stars (except Jupiter decametric emission). Planet definition depends on its formation mechanism. ...
... The discovery of planets (particularly transits) forced to discuss the issue, because low mass objects have similar sizes. Planets are opaque bodies that reflect light from their parent stars (except Jupiter decametric emission). Planet definition depends on its formation mechanism. ...
mufon ufo symposium -1974
... stars near the surface of the map, were put in just to show there were background stars. These probably do not represent individual stars.Betty concentrated on the stars connected with lines. There are over 100 stars in the Psyche volume. Betty saw the lined pattern as a whole and the triangle as a ...
... stars near the surface of the map, were put in just to show there were background stars. These probably do not represent individual stars.Betty concentrated on the stars connected with lines. There are over 100 stars in the Psyche volume. Betty saw the lined pattern as a whole and the triangle as a ...
Solar System evolution from compositional mapping of the asteroid
... two centuries since their first discovery, asteroids have been viewed as remnants of planetary formation. Located between Mars and Jupiter in the main asteroid belt (Fig. 1), they were thought to have formed essentially where they now are2. Early measurements showed asteroids in the inner part of th ...
... two centuries since their first discovery, asteroids have been viewed as remnants of planetary formation. Located between Mars and Jupiter in the main asteroid belt (Fig. 1), they were thought to have formed essentially where they now are2. Early measurements showed asteroids in the inner part of th ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... Explaining the concept of a scientific model, this lesson introduces the celestial sphere as a model to help describe and organize the night sky. Several specialists explain how different cultures named stars and constellations, and brought the aspects of the sky into their buildings and structures, ...
... Explaining the concept of a scientific model, this lesson introduces the celestial sphere as a model to help describe and organize the night sky. Several specialists explain how different cultures named stars and constellations, and brought the aspects of the sky into their buildings and structures, ...
TWO NEW LONG-PERIOD GIANT PLANETS FROM THE
... We report the detection of two new long-period giant planets orbiting the stars HD95872 and HD162004 (y1 Dra B) by the McDonald Observatory planet search. The planet HD95872b has a minimum mass of 4.6MJup and an orbital semimajor axis of 5.2 AU. The giant planet y1 Dra Bb has a minimum mass of 1 ...
... We report the detection of two new long-period giant planets orbiting the stars HD95872 and HD162004 (y1 Dra B) by the McDonald Observatory planet search. The planet HD95872b has a minimum mass of 4.6MJup and an orbital semimajor axis of 5.2 AU. The giant planet y1 Dra Bb has a minimum mass of 1 ...
Spin-driven tidal pumping: Tidally driven changes in planetary spin
... phase lag is diminished and one might expect the SDT effect to be weak. The effect is strongest when δ = 1 and the phase lag is 45°. This point is also addressed by Correia (2011) and Correia et al. (2013). The variation in spin rate given by Eq. (15) affects the secular behavior by modifying the co ...
... phase lag is diminished and one might expect the SDT effect to be weak. The effect is strongest when δ = 1 and the phase lag is 45°. This point is also addressed by Correia (2011) and Correia et al. (2013). The variation in spin rate given by Eq. (15) affects the secular behavior by modifying the co ...
The Galactic evolution of phosphorus
... in the [P/Fe] trend between the sample with and without planets. One should always bear in mind that for the stars “without planets” it cannot be excluded that they harbour undetected planets. We note, however, that all of the stars “without planets” in our sample, except for HD 215648 and HD 207978 ...
... in the [P/Fe] trend between the sample with and without planets. One should always bear in mind that for the stars “without planets” it cannot be excluded that they harbour undetected planets. We note, however, that all of the stars “without planets” in our sample, except for HD 215648 and HD 207978 ...
Definition of planet

The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.