The Milky Way
... E. Hubble (1913): Distant galaxies are moving away from our Milky Way, with a recession velocity, vr, proportional to their distance d: ...
... E. Hubble (1913): Distant galaxies are moving away from our Milky Way, with a recession velocity, vr, proportional to their distance d: ...
Slide 1
... large spirals, 12 dwarf ellipticals, 4 ellipticals, and 8 Irr. Dust in the plane of the Milky Way may obscure more. ...
... large spirals, 12 dwarf ellipticals, 4 ellipticals, and 8 Irr. Dust in the plane of the Milky Way may obscure more. ...
Exploring The Universe
... strong radio signal. This object was called a quasar. • quasar quasi-stellar radio sources; very luminous objects that produce energy at a high rate and that are thought to be the most distant objects in the universe • Each quasar has a huge central black hole and a large disk of gas and dust around ...
... strong radio signal. This object was called a quasar. • quasar quasi-stellar radio sources; very luminous objects that produce energy at a high rate and that are thought to be the most distant objects in the universe • Each quasar has a huge central black hole and a large disk of gas and dust around ...
Astronomy (stars, galaxies and the Universe)
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
... All stars are created from the gases in a nebula When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star dep ...
Our Vast Universe
... Kepler’s “Third Law” Relative distance within solar system known Size of universe unknown until one distance were known accurately ...
... Kepler’s “Third Law” Relative distance within solar system known Size of universe unknown until one distance were known accurately ...
Astronomy - Career Account Web Pages
... The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This object is at an extremely faint magnitude of 29, which is 500 million times fainter that the faintest stars seen by the human eye. The d ...
... The most distant objects in the universe appear extremely red because their light is stretched to longer, redder wavelengths by the expansion of the universe. This object is at an extremely faint magnitude of 29, which is 500 million times fainter that the faintest stars seen by the human eye. The d ...
How will the universe end?
... 10^23 years: dead stars boiled off from galactic clusters – clusters disintegrate – CMB radiation cooled to about 10^(-13) K everything except from black holes will tend to ionize black holes probably evaporate due to Hawking radiation – solar mass bhs in 10^66 years and galactic bhs in about 10^99 ...
... 10^23 years: dead stars boiled off from galactic clusters – clusters disintegrate – CMB radiation cooled to about 10^(-13) K everything except from black holes will tend to ionize black holes probably evaporate due to Hawking radiation – solar mass bhs in 10^66 years and galactic bhs in about 10^99 ...
Space Act - American Bar Association
... than the asteroid itself), the Act may be countering fears that mining operations would be contrary to the prohibition on appropriation of celestial bodies ensconced in Article II of the Outer Space Treaty. 27 Congress has also directed the President, along with “appropriate” agencies, to encourage ...
... than the asteroid itself), the Act may be countering fears that mining operations would be contrary to the prohibition on appropriation of celestial bodies ensconced in Article II of the Outer Space Treaty. 27 Congress has also directed the President, along with “appropriate” agencies, to encourage ...
Project Medley Topics
... Consider discussing the formation of the Sun, its structure and appearance, and the processes which produce sunlight. It should contain good factual information and must be at least 10 pages long. Be sure to state ahead of time the age group you plan to write for. If you choose not to keep the book, ...
... Consider discussing the formation of the Sun, its structure and appearance, and the processes which produce sunlight. It should contain good factual information and must be at least 10 pages long. Be sure to state ahead of time the age group you plan to write for. If you choose not to keep the book, ...
class 2, F10
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
- hcstonline.org
... 10. Describe one piece of evidence that supports the Big Bang Theory and explain why it supports it. (A5) 11. Explain how scientists can find evidence for something that happened more than 10 billion years ago. (A5) 12. Describe how Hubble’s Law supports the idea that the universe is expanding. (A6) ...
... 10. Describe one piece of evidence that supports the Big Bang Theory and explain why it supports it. (A5) 11. Explain how scientists can find evidence for something that happened more than 10 billion years ago. (A5) 12. Describe how Hubble’s Law supports the idea that the universe is expanding. (A6) ...
Your Guide to the Universe
... Solar System. These eruptions can be so large that their effects can reach our planet and cause serious damage by disrupting satellites and other communication devices. Our TV may be disrupted, our cell phones drop calls and if an astronaut happens to be on the sunlit side of the Moon when the Sun e ...
... Solar System. These eruptions can be so large that their effects can reach our planet and cause serious damage by disrupting satellites and other communication devices. Our TV may be disrupted, our cell phones drop calls and if an astronaut happens to be on the sunlit side of the Moon when the Sun e ...
Galactic astronomy - Sierra College Astronomy Home Page
... – Dust reradiates the absorbed energy in the infrared; – The most conspicuous type of bright emission nebula are HII regions. ...
... – Dust reradiates the absorbed energy in the infrared; – The most conspicuous type of bright emission nebula are HII regions. ...
ppt - Astronomy & Physics
... Once the greenhouse effect is established it will reach an equilibrium where the net radiation outward equals that coming in If you work out the amount of energy arriving from the Earth it is about 340 W m-2 Albedo serves to reduce the net radiation through the atmosphere to about 235 W m-2 Yet the ...
... Once the greenhouse effect is established it will reach an equilibrium where the net radiation outward equals that coming in If you work out the amount of energy arriving from the Earth it is about 340 W m-2 Albedo serves to reduce the net radiation through the atmosphere to about 235 W m-2 Yet the ...
Space, time & Cosmos Lecture 4: Our Galaxy
... The Heliosphere is a bubble in space produced by the solar wind. Virtually all the material in the heliosphere emanates from the Sun itself (though neutral atoms from interstellar space can penetrate this bubble). The solar wind streams off the Sun in all directions at speeds of several hundred kil ...
... The Heliosphere is a bubble in space produced by the solar wind. Virtually all the material in the heliosphere emanates from the Sun itself (though neutral atoms from interstellar space can penetrate this bubble). The solar wind streams off the Sun in all directions at speeds of several hundred kil ...
2. Chapter 11
... To be considered a planet, a body must orbit one or more stars, be large enough that its own gravity holds it in a spherical shape, and be the only body occupying the orbital path. Large distances keep our solar neighbourhood’s family of eight planets well separated from each other (Figure 11.9). In ...
... To be considered a planet, a body must orbit one or more stars, be large enough that its own gravity holds it in a spherical shape, and be the only body occupying the orbital path. Large distances keep our solar neighbourhood’s family of eight planets well separated from each other (Figure 11.9). In ...
Answers - Physics and Astronomy
... QUESTION 17: The universe became transparent when electrons and protons formed hydrogen atoms because: a) Atoms only absorb certain wavelengths of light b) The density of matter was so low c) Nucleosynthesis finally ceased d) There is less chance that a photon will hit an atom than an electron e) Th ...
... QUESTION 17: The universe became transparent when electrons and protons formed hydrogen atoms because: a) Atoms only absorb certain wavelengths of light b) The density of matter was so low c) Nucleosynthesis finally ceased d) There is less chance that a photon will hit an atom than an electron e) Th ...
STANDARD SET 4. Earth Sciences
... The Sun is a star located on the rim of a typical spiral galaxy called the Milky Way and orbits the galactic center. In similar spiral galaxies this galactic center appears as a bulge of stars in the heart of the disk. The bright band of stars cutting across the night sky is the edge of the Milky Wa ...
... The Sun is a star located on the rim of a typical spiral galaxy called the Milky Way and orbits the galactic center. In similar spiral galaxies this galactic center appears as a bulge of stars in the heart of the disk. The bright band of stars cutting across the night sky is the edge of the Milky Wa ...
Chapter 9 The Sun - Otto
... • Energy transported by rising hot gases • Cooler gas sinks • Convection cells vary in size with depth in convection zone • Tens of thousands of km to a thousand km convection cells • Photons from photosphere escape into space ...
... • Energy transported by rising hot gases • Cooler gas sinks • Convection cells vary in size with depth in convection zone • Tens of thousands of km to a thousand km convection cells • Photons from photosphere escape into space ...
Collapse: Method 2
... Small, dense, iron and silicate rich planets in the inner 2 AU. Slow rotors, few or no moons, no rings, differentiated (molten interiors) Large, low density, gaseous planets rich in H, He and volatile elements at >= 5 AU Rapid rotors, many moons, all have ring systems ...
... Small, dense, iron and silicate rich planets in the inner 2 AU. Slow rotors, few or no moons, no rings, differentiated (molten interiors) Large, low density, gaseous planets rich in H, He and volatile elements at >= 5 AU Rapid rotors, many moons, all have ring systems ...
Astronomy (stars, galaxies and the Universe)
... the matter and energy in the Universe was concentrated into single hot dense point called a singularity Tremendous amounts of heat and pressure made this point so unstable that it exploded ...
... the matter and energy in the Universe was concentrated into single hot dense point called a singularity Tremendous amounts of heat and pressure made this point so unstable that it exploded ...
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.