Scattering (and the blue sky)
... Blue light is scattered by dust more efficiently than red light, so dust seen in scattered light looks bluish. ...
... Blue light is scattered by dust more efficiently than red light, so dust seen in scattered light looks bluish. ...
Dark Matter
... b) More than 90% of the mass of the universe is dark matter c) When Milky Way & Andromeda Galaxy merge, GMC (Giant Molecular Clouds) will collide & lots of new stars will form d) Galaxies are distributed around huge empty volumes called voids e) All of these are correct ...
... b) More than 90% of the mass of the universe is dark matter c) When Milky Way & Andromeda Galaxy merge, GMC (Giant Molecular Clouds) will collide & lots of new stars will form d) Galaxies are distributed around huge empty volumes called voids e) All of these are correct ...
Review (PPT) - Uplift Summit Intl
... In most stars these forces are balanced over long periods but in Cepheid variables they seem to take turns, a bit like a mass bouncing up and down on a spring. The period of these stars varies between twelve hours and a hundred days. Because they are so luminous it means that very distant Cepheids c ...
... In most stars these forces are balanced over long periods but in Cepheid variables they seem to take turns, a bit like a mass bouncing up and down on a spring. The period of these stars varies between twelve hours and a hundred days. Because they are so luminous it means that very distant Cepheids c ...
Basic Properties of Stars
... Since cool objects don’t emit much light, these stars must be huge. They are red giants. Some stars are faint, but very hot. These must therefore be very small – they are white dwarf stars. ...
... Since cool objects don’t emit much light, these stars must be huge. They are red giants. Some stars are faint, but very hot. These must therefore be very small – they are white dwarf stars. ...
Lesson Planner Beyond our solar system.indd
... the largest. Ensure the children have arranged the items correctly, and resolve any disputes. Universe, galaxy, solar system, star, planet, moon. Ask: How can we see clearly into space and learn far more about the Universe than is possible with the naked eye? Using an extremely powerful telescope. P ...
... the largest. Ensure the children have arranged the items correctly, and resolve any disputes. Universe, galaxy, solar system, star, planet, moon. Ask: How can we see clearly into space and learn far more about the Universe than is possible with the naked eye? Using an extremely powerful telescope. P ...
Today`s Powerpoint
... b) size of the star increases. c) size of the telescope increases. d) length of the baseline increases. e) wavelength of light increases. ...
... b) size of the star increases. c) size of the telescope increases. d) length of the baseline increases. e) wavelength of light increases. ...
The Milky Way - TCNJ | The College of New Jersey
... • Random birth of Massive Stars • Their SN explosions compress nearby clouds & make new stars • Differential rotation of galaxy yields spiral appearance by streching the stars out • This best explains "rattier", broken-up spirals (like the Milky Way, though some Density ...
... • Random birth of Massive Stars • Their SN explosions compress nearby clouds & make new stars • Differential rotation of galaxy yields spiral appearance by streching the stars out • This best explains "rattier", broken-up spirals (like the Milky Way, though some Density ...
General Astronomy - Stockton University
... spectra lines. At the equator, the rotation velocity is only slightly less than escape velocity; if there is a slight eruption, a cloud of hydrogen escapes. – The type star, γ Cas is the brightest of the class, but it includes other well-known stars, such as Pleione (also known as BU Tau) in the Ple ...
... spectra lines. At the equator, the rotation velocity is only slightly less than escape velocity; if there is a slight eruption, a cloud of hydrogen escapes. – The type star, γ Cas is the brightest of the class, but it includes other well-known stars, such as Pleione (also known as BU Tau) in the Ple ...
Stars
... third law. The best place to apply this technique is an x-ray binary. In these systems one of the stars is seen in visible light and the other is a copious source of x-rays. The x-rays show the position of the (possible) black hole. ...
... third law. The best place to apply this technique is an x-ray binary. In these systems one of the stars is seen in visible light and the other is a copious source of x-rays. The x-rays show the position of the (possible) black hole. ...
Slide 1
... What `really’ would happen to DM in a baryon-dominated region – is it all evacuated dynamically, creating cores? Or vice versa: is a smooth potential adequate? Star cluster like model? How did – or did? – small DM halos virialise? What is the intermediate phase-mixing state as a star-forming region ...
... What `really’ would happen to DM in a baryon-dominated region – is it all evacuated dynamically, creating cores? Or vice versa: is a smooth potential adequate? Star cluster like model? How did – or did? – small DM halos virialise? What is the intermediate phase-mixing state as a star-forming region ...
Cetus and Lepus
... is a red-hued giant star of magnitude 2.5. It is a wide double star; the secondary is 93 Ceti, a blue-white hued star of magnitude 5.6 γ Ceti, Kaffaljidhma ("head of the whale") is a very close double star. The primary is a yellowhued star of magnitude 3.5, and the secondary is a blue-hued star of m ...
... is a red-hued giant star of magnitude 2.5. It is a wide double star; the secondary is 93 Ceti, a blue-white hued star of magnitude 5.6 γ Ceti, Kaffaljidhma ("head of the whale") is a very close double star. The primary is a yellowhued star of magnitude 3.5, and the secondary is a blue-hued star of m ...
Sun ECBAD - University of Arizona
... At the scale of the picture, the Sun should be much, much smaller than a dot so a dot is actually too large to represent the size of the Sun. In fact, the Sun’s diameter in light years is 1.4x10-8 light years = 1.4x10-11 mm so you could not see it as disk at the scale of the picture using even the b ...
... At the scale of the picture, the Sun should be much, much smaller than a dot so a dot is actually too large to represent the size of the Sun. In fact, the Sun’s diameter in light years is 1.4x10-8 light years = 1.4x10-11 mm so you could not see it as disk at the scale of the picture using even the b ...
ppt
... complex but observations suggest they must obey simple relations. Still, we do not have a good understanding and cannot work from first principles, so models must be observationally based. Fast method to compute the evolution of the galaxy population across cosmic time for samples as large as modern ...
... complex but observations suggest they must obey simple relations. Still, we do not have a good understanding and cannot work from first principles, so models must be observationally based. Fast method to compute the evolution of the galaxy population across cosmic time for samples as large as modern ...
The Universe
... Initially called the “primeval atom”, George Lemaitre hypothesized that the universe began as a small entity that expanded into the present-day universe according to the Hubble relation Refinements over several decades transformed the primeval atom hypothesis of Lemaitre into the Big Bang theory tha ...
... Initially called the “primeval atom”, George Lemaitre hypothesized that the universe began as a small entity that expanded into the present-day universe according to the Hubble relation Refinements over several decades transformed the primeval atom hypothesis of Lemaitre into the Big Bang theory tha ...
Day-5
... 1¼ seconds to arrive from the Moon. 8.3 minutes to arrive from the Sun. 5.5 hours to get to Pluto from the Sun. 4.3 years (yr) to get to the nearest star. 100,000 yr to cross the galaxy. 2.9 million yr to get to the nearest big galaxy. 10 billion yr to come from distant galaxies. ...
... 1¼ seconds to arrive from the Moon. 8.3 minutes to arrive from the Sun. 5.5 hours to get to Pluto from the Sun. 4.3 years (yr) to get to the nearest star. 100,000 yr to cross the galaxy. 2.9 million yr to get to the nearest big galaxy. 10 billion yr to come from distant galaxies. ...
Astronomy 401 Lecture 18 Galaxy Interactions Here we briefly
... it will spend half as much time near a given object and the impulse will be half as large. Then the density enhancement will develop only half as fast, and M will be twice as far away by the time the enhancement arises. This means that slow encounters are much more effective at decreasing the speed ...
... it will spend half as much time near a given object and the impulse will be half as large. Then the density enhancement will develop only half as fast, and M will be twice as far away by the time the enhancement arises. This means that slow encounters are much more effective at decreasing the speed ...
Getting to Know: Structure of the Universe
... be the size of a single speck of dust on that quarter. The Sun and our solar system are just one tiny part of the entire Milky Way galaxy. ...
... be the size of a single speck of dust on that quarter. The Sun and our solar system are just one tiny part of the entire Milky Way galaxy. ...
Solution key
... ___A___12. A particle of mass m falls from a large distance onto a black hole of mass M. The amount of gravitational energy released is A. mc2/2 B. mc2 C. Mc2/2 D. Mc2 E. Cannot be determined from the information given ___A___13. Which of the following optical filters would make the central star st ...
... ___A___12. A particle of mass m falls from a large distance onto a black hole of mass M. The amount of gravitational energy released is A. mc2/2 B. mc2 C. Mc2/2 D. Mc2 E. Cannot be determined from the information given ___A___13. Which of the following optical filters would make the central star st ...
The Modern Origins Story: From the Big Bang to Habitable Planets
... Size of Galaxy ~ 100,000 light-years ~ 100 billion stars (and planets); weighs ~ trillion Msun most of the mass “dark” -- not stars, gas, etc. – detected via gravity, not light ...
... Size of Galaxy ~ 100,000 light-years ~ 100 billion stars (and planets); weighs ~ trillion Msun most of the mass “dark” -- not stars, gas, etc. – detected via gravity, not light ...
The Milky Way - Houston Community College System
... With ground-based telescopes, we can measure parallaxes p ≥ 0.02 arc sec => d ≤ 50 pc ...
... With ground-based telescopes, we can measure parallaxes p ≥ 0.02 arc sec => d ≤ 50 pc ...
3. Galactic Dynamics handout 3 Aim: understand equilibrium of
... Spitzer found for many systems that rg = 2.5rh , where rh is the radius which contains half the mass Virial theorom implies: GM 2 M hv i = rg ...
... Spitzer found for many systems that rg = 2.5rh , where rh is the radius which contains half the mass Virial theorom implies: GM 2 M hv i = rg ...
v1 - ESO
... populations, suggest that they are predominantly very old systems. However, the main theory of galaxy formation predicts that they assembled their mass relatively recently, and should therefore be dynamically young. It is important to accurately quantify this apparent contradiction. The only way to ...
... populations, suggest that they are predominantly very old systems. However, the main theory of galaxy formation predicts that they assembled their mass relatively recently, and should therefore be dynamically young. It is important to accurately quantify this apparent contradiction. The only way to ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.