Ch. 21 notes-1
... They contain billions of stars but have little gas and dust. So they cannot form new star. They contain old stars. Irregular Galaxies Some galaxies do not have regular shapes. The Large Magellanic Cloud is an irregular galaxy about 160,000 light-years away from our galaxy. It is one of our clos ...
... They contain billions of stars but have little gas and dust. So they cannot form new star. They contain old stars. Irregular Galaxies Some galaxies do not have regular shapes. The Large Magellanic Cloud is an irregular galaxy about 160,000 light-years away from our galaxy. It is one of our clos ...
Slide 1
... • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”. ...
... • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”. ...
Size Scales - Leslie Looney
... • This Pluto thing (it’s old but still many students want to talk about it) • The Drake equation • Let’s take some time to get our bearings around the Universe. • We live in the Milky Way. ...
... • This Pluto thing (it’s old but still many students want to talk about it) • The Drake equation • Let’s take some time to get our bearings around the Universe. • We live in the Milky Way. ...
2011 - Edexcel
... 8 A group of students were observing the Perseid meteor shower that occurs annually in August. This shower is caused by a short-period comet. (a) Where is the origin of most short-period comets? ...
... 8 A group of students were observing the Perseid meteor shower that occurs annually in August. This shower is caused by a short-period comet. (a) Where is the origin of most short-period comets? ...
Study Guide Ch10,11 and 12
... to explain their energy output and other characteristics. 11. Briefly relate the story of the discovery of quasars 12. Describe the current explanation of quasars and their energy sources. ...
... to explain their energy output and other characteristics. 11. Briefly relate the story of the discovery of quasars 12. Describe the current explanation of quasars and their energy sources. ...
ppt
... – The Sun and the other bodies orbit around a common center of mass – The Sun is so massive that it is very close to the center of mass and moves very little – Orbits are elliptical, but very slightly so ...
... – The Sun and the other bodies orbit around a common center of mass – The Sun is so massive that it is very close to the center of mass and moves very little – Orbits are elliptical, but very slightly so ...
ISP 205: Visions of the Universe
... • How big is the Milky Way Galaxy? — It would take more than 3,000 years to count the stars in the Milky Way Galaxy at a rate of one per second. The Milky Way Galaxy is about 100,000 light-years across. ...
... • How big is the Milky Way Galaxy? — It would take more than 3,000 years to count the stars in the Milky Way Galaxy at a rate of one per second. The Milky Way Galaxy is about 100,000 light-years across. ...
class 1,S11
... • How did we come to be? —The matter in our bodies came from the Big Bang, which produced hydrogen and helium. —All other elements were constructed from H and He in stars and then recycled into new star systems, including our solar system. • How can we know what the universe was like in the past? • ...
... • How did we come to be? —The matter in our bodies came from the Big Bang, which produced hydrogen and helium. —All other elements were constructed from H and He in stars and then recycled into new star systems, including our solar system. • How can we know what the universe was like in the past? • ...
class 1,F10
... • How did we come to be? —The matter in our bodies came from the Big Bang, which produced hydrogen and helium. —All other elements were constructed from H and He in stars and then recycled into new star systems, including our solar system. • How can we know what the universe was like in the past? • ...
... • How did we come to be? —The matter in our bodies came from the Big Bang, which produced hydrogen and helium. —All other elements were constructed from H and He in stars and then recycled into new star systems, including our solar system. • How can we know what the universe was like in the past? • ...
Solutions to exercises
... have worked to a precision of only three significant figures, the approximation MP ) M∗ was applicable. (e) There are two basic approaches that could be used. To tackle the problem analytically, the full versions of Kepler’s third law (Equation 1.1) and Equation 1.13 would be used, and the algebra wou ...
... have worked to a precision of only three significant figures, the approximation MP ) M∗ was applicable. (e) There are two basic approaches that could be used. To tackle the problem analytically, the full versions of Kepler’s third law (Equation 1.1) and Equation 1.13 would be used, and the algebra wou ...
Document
... across many light years of space? The only thing that is almost certain is that they will use photons—fastest and cheapest way to transmit information that exists (as far as we know). Even though photon signals are the only choice we can think of, that still leaves many considerations that we need t ...
... across many light years of space? The only thing that is almost certain is that they will use photons—fastest and cheapest way to transmit information that exists (as far as we know). Even though photon signals are the only choice we can think of, that still leaves many considerations that we need t ...
L2 Star formation Part I
... Star formation takes place in cold, dense gas clouds: The molecular clouds. Stars form in groups or clusters. The largest GMC in Orion is about 1000 light years away. Hot young stars (25-50 million year old) ionize their surroundings and are therefore easily visible. ...
... Star formation takes place in cold, dense gas clouds: The molecular clouds. Stars form in groups or clusters. The largest GMC in Orion is about 1000 light years away. Hot young stars (25-50 million year old) ionize their surroundings and are therefore easily visible. ...
2. Velocity dispersions of galaxies
... • Cosmology is the scientific study of the large scale properties of the Universe as a whole. • It endeavors to use the scientific method to understand the origin, evolution and ultimate fate of the entire Universe. • Cosmology involves the formation of theories or hypotheses about the universe whic ...
... • Cosmology is the scientific study of the large scale properties of the Universe as a whole. • It endeavors to use the scientific method to understand the origin, evolution and ultimate fate of the entire Universe. • Cosmology involves the formation of theories or hypotheses about the universe whic ...
Kepler`s Laws, Newton`s Laws, and the Search for New Planets
... them conveniently for mathematical purposes, but if we are treating a problem in physics, then we must be aware of the physical consequences. In particular, inertial coordinates play a preferred role both in Newtonian physics and in special relativity. Third, although considerations of the general t ...
... them conveniently for mathematical purposes, but if we are treating a problem in physics, then we must be aware of the physical consequences. In particular, inertial coordinates play a preferred role both in Newtonian physics and in special relativity. Third, although considerations of the general t ...
galaxy.
... April 1920: the Curtis-Shapely debate Shapely (Harvard): Argued that spiral nebulae were inside our galaxy for several reasons • Galaxy was huge (he didn’t know about dust). • van Maanen’s observations showed that one spiral nebula, M 101, could be observed to rotate. It it were outside our galaxy, ...
... April 1920: the Curtis-Shapely debate Shapely (Harvard): Argued that spiral nebulae were inside our galaxy for several reasons • Galaxy was huge (he didn’t know about dust). • van Maanen’s observations showed that one spiral nebula, M 101, could be observed to rotate. It it were outside our galaxy, ...
The structure and evolution of stars
... (which we derived). We know the surface temperature (Teff=5780K) is much smaller than its minimum mean temperature (2×106 K). Thus we make two approximations for the surface boundary conditions: ρ = T = 0 at r=rs i.e. that the star does have a sharp boundary with the surrounding vacuum ...
... (which we derived). We know the surface temperature (Teff=5780K) is much smaller than its minimum mean temperature (2×106 K). Thus we make two approximations for the surface boundary conditions: ρ = T = 0 at r=rs i.e. that the star does have a sharp boundary with the surrounding vacuum ...
AN INTRODUCTION TO ASTRONOMY Dr. Uri Griv Department of Physics, Ben-Gurion University
... • The responce of the human eye works on the basis of a geometric progression rather than an arithmetic progression • The modern magnitude classification: a difference of 5 magnitudes to equal exactly a factor of 100 in apparent brightness • If m1 and m2 are the apparent magnitudes with apparent bri ...
... • The responce of the human eye works on the basis of a geometric progression rather than an arithmetic progression • The modern magnitude classification: a difference of 5 magnitudes to equal exactly a factor of 100 in apparent brightness • If m1 and m2 are the apparent magnitudes with apparent bri ...
Procedurally Generating an Artificial Galaxy
... The last step in determining the spatial distribution of stars is to generate the location of the stars within each cube. We will generate three random numbers (U1, U2, and U3) from U(0,1) for each star. These numbers determine the stars position in the three dimensions where 0 is at one edge of the ...
... The last step in determining the spatial distribution of stars is to generate the location of the stars within each cube. We will generate three random numbers (U1, U2, and U3) from U(0,1) for each star. These numbers determine the stars position in the three dimensions where 0 is at one edge of the ...
HABITABLE PLANETS For every star with planets, how many of
... If any of these factors are important for habitability, this could make ne extremely small, since the existence of our large moon is a very lowprobability event. This could mean ETI is very rare! E. Giant planets like Jupiter and Saturn? These eject most comets from the solar system. Otherwise, come ...
... If any of these factors are important for habitability, this could make ne extremely small, since the existence of our large moon is a very lowprobability event. This could mean ETI is very rare! E. Giant planets like Jupiter and Saturn? These eject most comets from the solar system. Otherwise, come ...
A Closer Earth and the Faint Young Sun Paradox
... Abstract: Given a solar luminosity LAr = 0.75L0 at the beginning of the Archean 3.8 Ga ago, where L0 is the present-day one, if the heliocentric distance, r, of the Earth was rAr = 0.956r0 , the solar irradiance would have been as large as IAr = 0.82I0 . It would have allowed for a liquid ocean on t ...
... Abstract: Given a solar luminosity LAr = 0.75L0 at the beginning of the Archean 3.8 Ga ago, where L0 is the present-day one, if the heliocentric distance, r, of the Earth was rAr = 0.956r0 , the solar irradiance would have been as large as IAr = 0.82I0 . It would have allowed for a liquid ocean on t ...
L5 - QUB Astrophysics Research Centre
... introductory articles provided, and supplement this with your own reading. You should attempt to clarify the problem for yourself and understand its importance. In particular you should discuss the following • Why and how have solar neutrinos been observed ? • What is their importance • Define and d ...
... introductory articles provided, and supplement this with your own reading. You should attempt to clarify the problem for yourself and understand its importance. In particular you should discuss the following • Why and how have solar neutrinos been observed ? • What is their importance • Define and d ...