Evidence for the Tidal Destruction of Hot Jupiters by Subgiant Stars
... that dominate the main-sequence sample. Consequently it has been unclear whether the absence of hot Jupiters is due to tidal destruction, or inhibited formation of those planets around massive stars. Here we show that the Galactic space motions of the planet-hosting subgiant stars demand that on ave ...
... that dominate the main-sequence sample. Consequently it has been unclear whether the absence of hot Jupiters is due to tidal destruction, or inhibited formation of those planets around massive stars. Here we show that the Galactic space motions of the planet-hosting subgiant stars demand that on ave ...
black hole
... dwarfs. When you surveyed the stars, you learned that white dwarfs are the second most common kind of star. (Only red dwarfs are more abundant.) The billions of white dwarfs in our galaxy must be the remains of medium-mass stars. ...
... dwarfs. When you surveyed the stars, you learned that white dwarfs are the second most common kind of star. (Only red dwarfs are more abundant.) The billions of white dwarfs in our galaxy must be the remains of medium-mass stars. ...
19_Testbank - Lick Observatory
... A) Spheroidal stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue spheroidal stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk ...
... A) Spheroidal stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue spheroidal stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the spheroid formed earlier than the disk. E) We see evidence for new stars forming in the disk ...
Small galaxies are growing smaller
... astronomer Sylvia Mussells on plates taken by Shapley (see A&G 2003 45 1.18). Sculptor, in particular, was very much less luminous (by another factor ~100) than previously known galaxies – with modern distance estimates it has MV ≈ –10 – and these two were the first examples of dwarf spheroidal gala ...
... astronomer Sylvia Mussells on plates taken by Shapley (see A&G 2003 45 1.18). Sculptor, in particular, was very much less luminous (by another factor ~100) than previously known galaxies – with modern distance estimates it has MV ≈ –10 – and these two were the first examples of dwarf spheroidal gala ...
IR Universe
... horizontally across the image. Blue sources are cool stars within our Galaxy, which show an obvious concentration to the galactic plane and center. Yellow-green sources are galaxies which are basically uniformly distributed across the sky, but show an enhancement along a great circle above the galac ...
... horizontally across the image. Blue sources are cool stars within our Galaxy, which show an obvious concentration to the galactic plane and center. Yellow-green sources are galaxies which are basically uniformly distributed across the sky, but show an enhancement along a great circle above the galac ...
Lecture 3 - University of Washington
... around at a different speed than star: stars thus move in and out of the spiral arm • How these density waves are set up is unclear, but it may have to do with interactions. Once they are set up, they must last for a long enough time to be consistent with the observed number of spiral galaxies ...
... around at a different speed than star: stars thus move in and out of the spiral arm • How these density waves are set up is unclear, but it may have to do with interactions. Once they are set up, they must last for a long enough time to be consistent with the observed number of spiral galaxies ...
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 ...
GALILEO AND THE PHASES OF VENUS Abstract
... horns thin and still turned away from the Sun; it will go on growing toward a half-circle until maximum elongation. Then it will remain semicircular for some days, though diminishing in bulk; then from the semi-circle it will pass to ail round in a few days, and will be seen that way for many month ...
... horns thin and still turned away from the Sun; it will go on growing toward a half-circle until maximum elongation. Then it will remain semicircular for some days, though diminishing in bulk; then from the semi-circle it will pass to ail round in a few days, and will be seen that way for many month ...
The Marine Sextant
... • These corrections are all that are needed under normal circumstances to determine Ho of a star. • An additional correction is required if the observation is made under nonstandard conditions of temperature or pressure. ...
... • These corrections are all that are needed under normal circumstances to determine Ho of a star. • An additional correction is required if the observation is made under nonstandard conditions of temperature or pressure. ...
Neptune, Pluto and Quaoar
... In 1845, a Cambridge mathematician, John Couch Adams, predicted the existence of an unseen planet to account for the fact that Uranus was being pulled slightly out of position in its orbit. Adams attributed this pull to the gravitational effect of an unknown body, and calculated its position. Adams ...
... In 1845, a Cambridge mathematician, John Couch Adams, predicted the existence of an unseen planet to account for the fact that Uranus was being pulled slightly out of position in its orbit. Adams attributed this pull to the gravitational effect of an unknown body, and calculated its position. Adams ...
Pluto Reading
... Pluto is a dwarf planet (or plutoid) that usually orbits past the orbit of Neptune. It was classified as a dwarf planet in 2006; before that it was considered to be a planet, the smallest planet in our solar system. There are many other dwarf planets in our Solar System. Pluto is smaller than a lot ...
... Pluto is a dwarf planet (or plutoid) that usually orbits past the orbit of Neptune. It was classified as a dwarf planet in 2006; before that it was considered to be a planet, the smallest planet in our solar system. There are many other dwarf planets in our Solar System. Pluto is smaller than a lot ...
File - xaviantvision
... volcanic eminences that dwarf the highest mountain on Earth; ancient river valleys on two planets enigmatically one too cold and the other too hot for running water; a giant planet with an interior of liquid metallic hydrogen into which a thousand Earths would fit; whole moons that have melted; a cl ...
... volcanic eminences that dwarf the highest mountain on Earth; ancient river valleys on two planets enigmatically one too cold and the other too hot for running water; a giant planet with an interior of liquid metallic hydrogen into which a thousand Earths would fit; whole moons that have melted; a cl ...
Here
... •Fainter systems are bluer This could be explained if small E galaxies were younger or more metalpoor than the large bright ones. ...
... •Fainter systems are bluer This could be explained if small E galaxies were younger or more metalpoor than the large bright ones. ...
Origin and loss of nebula-captured hydrogen envelopes from `sub`
... Once protoplanets orbiting a host star embedded in a protoplanetary nebula gain enough mass for their gravitational potential to become significant relatively to the local gas internal and turbulent motion energy, they will start to accumulate nebula gas into their atmospheres. Hydrostatic and spher ...
... Once protoplanets orbiting a host star embedded in a protoplanetary nebula gain enough mass for their gravitational potential to become significant relatively to the local gas internal and turbulent motion energy, they will start to accumulate nebula gas into their atmospheres. Hydrostatic and spher ...
Astronomy Chapter 17 – Galaxies A. Main Ideas 1. Discovering
... ⇒ All galaxies are extremely distant from Earth, the nearest is more than 150,000 light-year away. Few can be seen with the naked eye. In the Northern Hemisphere the galaxy M31 appears as a pale smudge in the constellation Andromeda. ⇒ In the 18th and 19 centuries astronomers began catalogue the obj ...
... ⇒ All galaxies are extremely distant from Earth, the nearest is more than 150,000 light-year away. Few can be seen with the naked eye. In the Northern Hemisphere the galaxy M31 appears as a pale smudge in the constellation Andromeda. ⇒ In the 18th and 19 centuries astronomers began catalogue the obj ...
24.1 Hubble`s Galaxy Classification
... clusters in the halo of our Galaxy, while Cepheid variables, being so much brighter, allow measurement of galaxies to about 25 Mpc away. The image below shows a Cepheid variable spotted in a galaxy in the Virgo Cluster of galaxies. You can see it getting fainter and brighter in the insets. ...
... clusters in the halo of our Galaxy, while Cepheid variables, being so much brighter, allow measurement of galaxies to about 25 Mpc away. The image below shows a Cepheid variable spotted in a galaxy in the Virgo Cluster of galaxies. You can see it getting fainter and brighter in the insets. ...
Galactic Archaeology: Current Surveys
... The spectra from the SDSS surveys provide line-of-sight velocities to around 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high sig ...
... The spectra from the SDSS surveys provide line-of-sight velocities to around 10 km/s. The values of the stellar atmospheric parameters are obtained through a dedicated pipeline (Lee et al. 2008), developed for the broad range of targets and giving metallicity estimates to ∼ 0.2 dex, and for high sig ...
Other Planetary Systems - Colorado Mesa University
... 1) Old enough to allow time for evolution (rules out high-mass stars - 1%) 2) Need to have stable orbits (might rule out binary/multiple star systems - 50%) 3) Size of “habitable zone”: region in which a planet of the right size could have liquid water on its surface Even with these constraints, ...
... 1) Old enough to allow time for evolution (rules out high-mass stars - 1%) 2) Need to have stable orbits (might rule out binary/multiple star systems - 50%) 3) Size of “habitable zone”: region in which a planet of the right size could have liquid water on its surface Even with these constraints, ...
Notes - Bill Wolf
... and luminosity to denote how much light the star is actually giving off. These two words have analogous magnitude scales. The magnitude scale that measures brightness is the one that Hipparchus thought up. We call it Apparent Magnitude, often denoted m. The scale corresponding to luminosity is calle ...
... and luminosity to denote how much light the star is actually giving off. These two words have analogous magnitude scales. The magnitude scale that measures brightness is the one that Hipparchus thought up. We call it Apparent Magnitude, often denoted m. The scale corresponding to luminosity is calle ...
TEKS Presentation Earth and Space Systems
... produce a “tail” behind the comet. Larger comets may even become visible without the aid of a telescope. ...
... produce a “tail” behind the comet. Larger comets may even become visible without the aid of a telescope. ...
Plotting Variable Stars on the H
... Semiregular variable stars through the instability strips they are pulsationally unstable – expanding and brightening, then The Cambridge Encyclopedia of contracting and become dimmer. The instability strips for Stars, J B Taylor, © 2006 Miras and Cepheids are especially elongated because of these e ...
... Semiregular variable stars through the instability strips they are pulsationally unstable – expanding and brightening, then The Cambridge Encyclopedia of contracting and become dimmer. The instability strips for Stars, J B Taylor, © 2006 Miras and Cepheids are especially elongated because of these e ...
Rare Earth hypothesis
In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.