Protogalaxies
... universe. Obviously this is not the only possible path: a young elliptical may be made by merging a thousand small fragments early on. While some ellipticals may be formed in late, major mergers, many studies of elliptical galaxy properties in clusters at low and moderate redshifts suggest that most ...
... universe. Obviously this is not the only possible path: a young elliptical may be made by merging a thousand small fragments early on. While some ellipticals may be formed in late, major mergers, many studies of elliptical galaxy properties in clusters at low and moderate redshifts suggest that most ...
Electronic Text Book Unit 11
... The time of day A clock tells you the exact time of day and is used to mark the division of the day into equal parts. It may be hard to imagine, but there once was a time when humans did not need to keep track of the exact time of day. The rise and fall of the sun was the only “clock” that prehistor ...
... The time of day A clock tells you the exact time of day and is used to mark the division of the day into equal parts. It may be hard to imagine, but there once was a time when humans did not need to keep track of the exact time of day. The rise and fall of the sun was the only “clock” that prehistor ...
EvoluGon of high mass stars Solar-‐type stars end their lives by
... the extremely short period. The discovery of a pulsar in the Crab nebula, a well-‐known supernova remnant (the supernova was recorded in Chinese records from 1054), finally demonstrated that the pulsars ...
... the extremely short period. The discovery of a pulsar in the Crab nebula, a well-‐known supernova remnant (the supernova was recorded in Chinese records from 1054), finally demonstrated that the pulsars ...
About the Infinite Repetition of Histories in Space - Philsci
... and so forth. In addition, the library also contains the translation of every book to every language, either actual or just possible. However, both the library and the number of books in it are not infinite. If the library were actually infinite (Borges suggests this possibility at the end of the st ...
... and so forth. In addition, the library also contains the translation of every book to every language, either actual or just possible. However, both the library and the number of books in it are not infinite. If the library were actually infinite (Borges suggests this possibility at the end of the st ...
distance
... We can measure the time it takes to complete a cycle: the period The stars are called “Cepheid Variables” after the first one discovered, in the ...
... We can measure the time it takes to complete a cycle: the period The stars are called “Cepheid Variables” after the first one discovered, in the ...
Molecular Shapes and Polarity
... b. Novex Mining Corporation leaves debris in orbit of the asteroid Ceres. (1 mark) c. The entire human race wishes to populate the ocean on one of Jupiter’s small moons, Ganymede. Hundreds of creatures already live in that ocean. (1 mark) d. The Galactic Empire has begun mining operations on planet ...
... b. Novex Mining Corporation leaves debris in orbit of the asteroid Ceres. (1 mark) c. The entire human race wishes to populate the ocean on one of Jupiter’s small moons, Ganymede. Hundreds of creatures already live in that ocean. (1 mark) d. The Galactic Empire has begun mining operations on planet ...
Untitled
... atmosphere by turbulent heat exchanges, so that the ground temperature cannot deviate much from that of the immediately overlying air. Thus, Ts = T (ps ). If the atmosphere were transparent to infrared, as is very nearly the case for nitrogen or oxygen, the OLR would be σ Ts4 . Now, let’s stir an ad ...
... atmosphere by turbulent heat exchanges, so that the ground temperature cannot deviate much from that of the immediately overlying air. Thus, Ts = T (ps ). If the atmosphere were transparent to infrared, as is very nearly the case for nitrogen or oxygen, the OLR would be σ Ts4 . Now, let’s stir an ad ...
Galaxies
... are also nearly all the same color: somewhat redder than the Sun. On the tuning fork diagram, they are classified as E, followed by a number indicating how elliptical a given galaxy is. The higher the number, the more elliptical the galaxy; that is, the longer the galaxy is with respect to its width ...
... are also nearly all the same color: somewhat redder than the Sun. On the tuning fork diagram, they are classified as E, followed by a number indicating how elliptical a given galaxy is. The higher the number, the more elliptical the galaxy; that is, the longer the galaxy is with respect to its width ...
Spectroscopic confirmation of a galaxy at redshift z=8.6
... other initial mass function is the one that only contains massive stars, .100M[, which have zero metallicity18. For this top-heavy initial mass function, we only considered ages of 10 and 100 Myr because it is unrealistic for metal-free star formation to persist after the first supernova explosions, ...
... other initial mass function is the one that only contains massive stars, .100M[, which have zero metallicity18. For this top-heavy initial mass function, we only considered ages of 10 and 100 Myr because it is unrealistic for metal-free star formation to persist after the first supernova explosions, ...
No Slide Title
... • High-precision NIR photometry straddling peak of stellar SEDs by Low et al. (1999) find Teff(A) = 3831±55K, Teff(B) = 3459±37K, no NIR excess. They suggest scattered:total light from B < 6% -> PDS < 0.3. Suggest a PDS with an "equivalent" radius = 2AU, an actual rinner ~ 4.5AU, subtending no more ...
... • High-precision NIR photometry straddling peak of stellar SEDs by Low et al. (1999) find Teff(A) = 3831±55K, Teff(B) = 3459±37K, no NIR excess. They suggest scattered:total light from B < 6% -> PDS < 0.3. Suggest a PDS with an "equivalent" radius = 2AU, an actual rinner ~ 4.5AU, subtending no more ...
5-th_state_matter - The 5th state of matter
... energetic plasma? If yes, this plasma would emit the received electric power of 26 W as a heatradiation of 26 W (equ.1)! The TV electron beam is no simple “electric current flowing somehow in vacuum”. The electrons should electrostatically explode in vacuum, they have no positive copper ions which k ...
... energetic plasma? If yes, this plasma would emit the received electric power of 26 W as a heatradiation of 26 W (equ.1)! The TV electron beam is no simple “electric current flowing somehow in vacuum”. The electrons should electrostatically explode in vacuum, they have no positive copper ions which k ...
The Milky Way: Cartoon
... Finding MACHOS we can’t see Recap: Gravitational Lensing: positions of background stars will change when observed along a sight-line near a massive object. Like the sun. Observation of apparent change in star positions during a solar eclipse (when we can see close to the sun) in 1919 was a first pr ...
... Finding MACHOS we can’t see Recap: Gravitational Lensing: positions of background stars will change when observed along a sight-line near a massive object. Like the sun. Observation of apparent change in star positions during a solar eclipse (when we can see close to the sun) in 1919 was a first pr ...
- The 5th state of matter
... energetic plasma? If yes, this plasma would emit the received electric power of 26 W as a heatradiation of 26 W (equ.1)! The TV electron beam is no simple “electric current flowing somehow in vacuum”. The electrons should electrostatically explode in vacuum, they have no positive copper ions which k ...
... energetic plasma? If yes, this plasma would emit the received electric power of 26 W as a heatradiation of 26 W (equ.1)! The TV electron beam is no simple “electric current flowing somehow in vacuum”. The electrons should electrostatically explode in vacuum, they have no positive copper ions which k ...
Chapter 27
... • Taking advantage of the constant speed of light, we can look back in time to see how galaxies have evolved. • The most distant galaxies we can see are the oldest. • Using the Hubble Telescope, astronomers can see back more than 10 billion years, to see galaxies soon after they’d formed. • The earl ...
... • Taking advantage of the constant speed of light, we can look back in time to see how galaxies have evolved. • The most distant galaxies we can see are the oldest. • Using the Hubble Telescope, astronomers can see back more than 10 billion years, to see galaxies soon after they’d formed. • The earl ...
the opportunities and challenges for astrometry in the 21st century
... measure the orbital parameters of dwarf galaxies that are merging with the Milky Way, define the kinematics, dynamics and structure of our Galaxy and search for evidence of the Dark Matter that makes up most of the mass in the universe. Stellar masses will be determined routinely to 1% accuracy so t ...
... measure the orbital parameters of dwarf galaxies that are merging with the Milky Way, define the kinematics, dynamics and structure of our Galaxy and search for evidence of the Dark Matter that makes up most of the mass in the universe. Stellar masses will be determined routinely to 1% accuracy so t ...
Summary of recent research activities
... the tip of the southern tail of the Antennae galaxies, but then Mirabel et al. (1992, A&A, 256, L19) claimed that the TDG is actually located where stars are forming inside the tail. To investigate this issue, I joined a project involving UCLA and NRAO researchers, that had HST/WFPC2 imaging of the ...
... the tip of the southern tail of the Antennae galaxies, but then Mirabel et al. (1992, A&A, 256, L19) claimed that the TDG is actually located where stars are forming inside the tail. To investigate this issue, I joined a project involving UCLA and NRAO researchers, that had HST/WFPC2 imaging of the ...
The Dynamic Universe – space as a spherically closed energy system
... to the great mystery of the equality of the total rest energy and gravitational energy. Obviously, Feynman did not take into consideration the possibility of a dynamic solution – in fact, such a solution does not work in the framework of the theory of relativity, which is based on time as the fourth ...
... to the great mystery of the equality of the total rest energy and gravitational energy. Obviously, Feynman did not take into consideration the possibility of a dynamic solution – in fact, such a solution does not work in the framework of the theory of relativity, which is based on time as the fourth ...
View the pdf here
... these after i’ve read the whole twice. but what i want to say at the moment about poe, robinson, and epistemology is this: we do wrong (i did wrong below) to contrast science and (say) aesthetic or poetic or intuitive paths toward the truth. look poe was a literary person and he struggled toward the ...
... these after i’ve read the whole twice. but what i want to say at the moment about poe, robinson, and epistemology is this: we do wrong (i did wrong below) to contrast science and (say) aesthetic or poetic or intuitive paths toward the truth. look poe was a literary person and he struggled toward the ...
New Horizons Spacecraft `Stays the Course` for Pluto System
... The Night Sky Friday, June 21 · As Mercury fades and descends below Venus day by day, how long can you keep it in view? ...
... The Night Sky Friday, June 21 · As Mercury fades and descends below Venus day by day, how long can you keep it in view? ...
Galaxies have different sizes and shapes.
... 26,000 light-years from the Sun. A large but very faint layer of stars surrounds the disk and bulge. In addition to stars, the Milky Way contains clouds of gas and dust called nebulae. The stars and nebulae in the Milky Way orbit the galaxy’s center at very high speeds. However, the galaxy is so lar ...
... 26,000 light-years from the Sun. A large but very faint layer of stars surrounds the disk and bulge. In addition to stars, the Milky Way contains clouds of gas and dust called nebulae. The stars and nebulae in the Milky Way orbit the galaxy’s center at very high speeds. However, the galaxy is so lar ...
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 ...
Option D – Astrophysics
... a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. ...
... a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. ...
poster_IAU244 - ANU - Australian National University
... and star formation in galaxies as a function of redshift and environment. Our study combines deep radio observations of HI 21cm emission using the Giant Metrewave Radio Telescope (GMRT) in India with optical imaging and spectroscopy. The main results presented here are from a sample of 348 Hα-emitti ...
... and star formation in galaxies as a function of redshift and environment. Our study combines deep radio observations of HI 21cm emission using the Giant Metrewave Radio Telescope (GMRT) in India with optical imaging and spectroscopy. The main results presented here are from a sample of 348 Hα-emitti ...
HST Key Project to Measure the Hubble Constant from
... in size (get brighter as they grow larger, dim as they shrink) Can’t achieve balance of power welling up from core and power radiating from surface ...
... in size (get brighter as they grow larger, dim as they shrink) Can’t achieve balance of power welling up from core and power radiating from surface ...
Outer space
Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.