![Astronomy Facts](http://s1.studyres.com/store/data/017280694_1-fe7b9ecbd7d652b285a5ee1477a3f3cc-300x300.png)
Astronomy Facts
... The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The brightest stars are over 10,000 times brighter than the sun. The dista ...
... The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The brightest stars are over 10,000 times brighter than the sun. The dista ...
Galaxies
... concentration (3%) heavy elements Population II – red, old, found in bulge and halo, elliptical orbits, low concentration of heavy elements Probably smooth transition between end members (i.e. the sun). ? Population III ? – pure H and He ...
... concentration (3%) heavy elements Population II – red, old, found in bulge and halo, elliptical orbits, low concentration of heavy elements Probably smooth transition between end members (i.e. the sun). ? Population III ? – pure H and He ...
Lecture 31
... sources) and found its distance from its redshift to be 2 billion light years--not a star, and L = 1040 watts--1,000 L (MW)!! .8 to 14(?) Billion years--distance range. L = 1038-1042 watts. Energy comes from a region solar system-sized. Radio Jets. A thermal (synchotron) and non-thermal (black-body) ...
... sources) and found its distance from its redshift to be 2 billion light years--not a star, and L = 1040 watts--1,000 L (MW)!! .8 to 14(?) Billion years--distance range. L = 1038-1042 watts. Energy comes from a region solar system-sized. Radio Jets. A thermal (synchotron) and non-thermal (black-body) ...
Gresham Lecture, Wednesday 15 December 2010 Unsolved
... conclusion - there must be a form of matter out there that we cannot see - which became known as 'dark matter'. So what is dark matter made of? No one knows for sure. Normal matter, making up the stars, planets and ourselves, is made of atoms, which are composed of protons, neutrons and electrons. ...
... conclusion - there must be a form of matter out there that we cannot see - which became known as 'dark matter'. So what is dark matter made of? No one knows for sure. Normal matter, making up the stars, planets and ourselves, is made of atoms, which are composed of protons, neutrons and electrons. ...
Hubble’s Law & Black Holes at a Galaxy’s Center
... Simplicio: You tell me the universe is expanding, and some things do move away but other things do not. How does a thing know what to do? 3. Sagredo explains: The fundamental reason is a. Galaxies move away; other things do not. b. Big objects move away; little objects do not. c. If the force holdin ...
... Simplicio: You tell me the universe is expanding, and some things do move away but other things do not. How does a thing know what to do? 3. Sagredo explains: The fundamental reason is a. Galaxies move away; other things do not. b. Big objects move away; little objects do not. c. If the force holdin ...
Dark matter
... The universe is flat on large scales; there isn’t enough mass to do the flattening, so there must be energy. If the energy emitted light, we’d have seen it by now, so it must be dark energy. ...
... The universe is flat on large scales; there isn’t enough mass to do the flattening, so there must be energy. If the energy emitted light, we’d have seen it by now, so it must be dark energy. ...
Cosmology, galaxies, stars and the sun
... The Nebular Theory states that gaseous clouds—nebulae(most likely the remnants of a massive supernova), slowly rotate, gradually collapse and flatten due to gravity and eventually form stars and planets. ...
... The Nebular Theory states that gaseous clouds—nebulae(most likely the remnants of a massive supernova), slowly rotate, gradually collapse and flatten due to gravity and eventually form stars and planets. ...
Linking Asteroids and Meteorites through Reflectance
... • A light year is the distance light travels in a year • The speed of light is the fastest anything can travel in the universe • How far is a light year: (3 x 108 m/s) x (1 yr) x (365 days/yr) x (24 hr/day) x (60 min/hr) x (60 s/min) = 9.46 x 1015 m ...
... • A light year is the distance light travels in a year • The speed of light is the fastest anything can travel in the universe • How far is a light year: (3 x 108 m/s) x (1 yr) x (365 days/yr) x (24 hr/day) x (60 min/hr) x (60 s/min) = 9.46 x 1015 m ...
100 million years after the Big Bang
... • assembly of galaxy mass as a function of look-back time • Pair production SNe (massive stars) at MK = -23 • Young globular clusters with 106 year free fall times and M/L ...
... • assembly of galaxy mass as a function of look-back time • Pair production SNe (massive stars) at MK = -23 • Young globular clusters with 106 year free fall times and M/L ...
Cosmic Distance Ladder
... • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. • E.g. Hipparcos 0 ...
... • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. • E.g. Hipparcos 0 ...
here
... apart. The idea was that the first observer opens a shutter in a lantern and then as soon as the second observer sees the light from the first lantern, opens his shutter. Galileo would then measure the time it takes from opening the first shutter to seeing the light from the second lantern arrive at ...
... apart. The idea was that the first observer opens a shutter in a lantern and then as soon as the second observer sees the light from the first lantern, opens his shutter. Galileo would then measure the time it takes from opening the first shutter to seeing the light from the second lantern arrive at ...
Name
... Read Section 16-1 on pages 344-348 of SP to help you answer the following questions: 22. The life cycle of stars are generally measured in ________________ of years. 23. What is meant by a nebula? Particles in a nebula join together and form clumps. These clumps attract each other with the force of ...
... Read Section 16-1 on pages 344-348 of SP to help you answer the following questions: 22. The life cycle of stars are generally measured in ________________ of years. 23. What is meant by a nebula? Particles in a nebula join together and form clumps. These clumps attract each other with the force of ...
Nov 2009
... (h) State the two quantities that need to be measured in order to use a Cepheid variable as a “standard candle” to determine the distance to the galaxy in which the Cepheid is located. ...
... (h) State the two quantities that need to be measured in order to use a Cepheid variable as a “standard candle” to determine the distance to the galaxy in which the Cepheid is located. ...
Document
... most stable burning object in Milky Way galaxy with a very low .1% variance (over 11 years span), so small it has no impact on Earth's climate. The search for a very stable burning star like our sun is called a solar twin. An identical solar twin has yet to be found, closest is stars with about 3% v ...
... most stable burning object in Milky Way galaxy with a very low .1% variance (over 11 years span), so small it has no impact on Earth's climate. The search for a very stable burning star like our sun is called a solar twin. An identical solar twin has yet to be found, closest is stars with about 3% v ...
HighRedshiftGalaxies
... In addition to the scatter arising from extinction (accounted for via individual Balmer emission line decrements), somebody suggests that some fraction of their UV-selected population must be suffering star formation which is erratic in its time history. In such a situation, different diagnostics wi ...
... In addition to the scatter arising from extinction (accounted for via individual Balmer emission line decrements), somebody suggests that some fraction of their UV-selected population must be suffering star formation which is erratic in its time history. In such a situation, different diagnostics wi ...
Study Guide 4 Part A Outline
... o The Hubble Law implies Universe is expanding The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large ...
... o The Hubble Law implies Universe is expanding The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large ...
Cosmic Distance Ladder
... • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. • E.g. Hipparcos 0 ...
... • Reliable measurements, those with errors of 10% or less, can only be achieved at stellar distances of no more than about 100 pc. • Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. • E.g. Hipparcos 0 ...
Astronomy (stars, galaxies and the Universe)
... Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
... Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
Astronomy (stars, galaxies and the Universe)
... Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
... Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
printer-friendly sample test questions
... 1st Item Specification: Recognize the red shift effect and know that the most distant objects have the greatest degree of red shift. Depth of Knowledge Level 1 1. The expansion of the universe was first deduced from A. Edwin Hubble showing that more distant galaxies are moving away more rapidly. B. ...
... 1st Item Specification: Recognize the red shift effect and know that the most distant objects have the greatest degree of red shift. Depth of Knowledge Level 1 1. The expansion of the universe was first deduced from A. Edwin Hubble showing that more distant galaxies are moving away more rapidly. B. ...
Chapter 1-Thinking about the universe
... travel but his universe rotated and didn’t not expand, ours does. To go back in time, one must go faster than the speed of light, which is supposed to be impossible. But it still is theoretically possible through the use of a wormhole. A wormhole is a straight tunnel in curved space that would short ...
... travel but his universe rotated and didn’t not expand, ours does. To go back in time, one must go faster than the speed of light, which is supposed to be impossible. But it still is theoretically possible through the use of a wormhole. A wormhole is a straight tunnel in curved space that would short ...
Universe and Stars Project Final Due Date
... 2. Describe scientific explanations and conditions that explain and contributed to the origin of life on Earth (give at least 3 examples of conditions that contributed to life on Earth). http://www.ecology.com/2011/09/10/earths-beginnings-origins-life/ 3. Describe how the universe is organized and w ...
... 2. Describe scientific explanations and conditions that explain and contributed to the origin of life on Earth (give at least 3 examples of conditions that contributed to life on Earth). http://www.ecology.com/2011/09/10/earths-beginnings-origins-life/ 3. Describe how the universe is organized and w ...
Chapter 15 Stars, Galaxies
... become black holes. Stars that are less massive but still high-mass stars become neutron stars. f. They all start out as a part of nebulas that contract to form protostars. g. Low-mass and medium-mass stars turn into red giants as they use up their fuel. They later form planetary nebulas and white d ...
... become black holes. Stars that are less massive but still high-mass stars become neutron stars. f. They all start out as a part of nebulas that contract to form protostars. g. Low-mass and medium-mass stars turn into red giants as they use up their fuel. They later form planetary nebulas and white d ...
Observable universe
![](https://commons.wikimedia.org/wiki/Special:FilePath/Observable_Universe_with_Measurements_01.png?width=300)
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.