Solutions for homework #5, AST 203, Spring 2009
... masses. But, even if it were a globular cluster, it would be way too compact – we want it to fit inside the orbit of 5.2 × 1014 m, which is roughly 0.01 of a parsec. A typical globular cluster would be at least several parsecs in radius (typically, 10pc). In fact, we know of only one type of object ...
... masses. But, even if it were a globular cluster, it would be way too compact – we want it to fit inside the orbit of 5.2 × 1014 m, which is roughly 0.01 of a parsec. A typical globular cluster would be at least several parsecs in radius (typically, 10pc). In fact, we know of only one type of object ...
Astronomical Beliefs - Communicating Astronomy With The Public
... Moon and rain season When a new moon appears, people expect perpetual rains. It is believe: the rain is washing and strengthening the moon. Dry spells are expected when the moon is strengthened –full moon. ...
... Moon and rain season When a new moon appears, people expect perpetual rains. It is believe: the rain is washing and strengthening the moon. Dry spells are expected when the moon is strengthened –full moon. ...
Foundation 1 - Discovering Astronomy
... Plotting all the stars from a cluster on an H-R diagram reveals its age ...
... Plotting all the stars from a cluster on an H-R diagram reveals its age ...
Habitability
... • Sun’s luminosity has been changing: earlier in its evolution, luminosity was only 70% of what it is today (how could temperature be maintained over geological time) • Future for luminosity – Remember life cycle of stars – In another 2-3 BY, luminosity will place Earth outside habitability zone – M ...
... • Sun’s luminosity has been changing: earlier in its evolution, luminosity was only 70% of what it is today (how could temperature be maintained over geological time) • Future for luminosity – Remember life cycle of stars – In another 2-3 BY, luminosity will place Earth outside habitability zone – M ...
Orbits
... But gravity is a very weak force, so most gravitational forces at the Earth’s surface can be ignored. The gravitational field of a pen, a person or even a large mountain is too weak to have a noticeable effect, so the only gravitational field you need to consider is Earth’s. ...
... But gravity is a very weak force, so most gravitational forces at the Earth’s surface can be ignored. The gravitational field of a pen, a person or even a large mountain is too weak to have a noticeable effect, so the only gravitational field you need to consider is Earth’s. ...
Pictures in the Sky Teacher`s Guide
... Have your students color the planets on page 7 as described below. You may have to read the descriptions to your students, then see if they can figure out which planet is which and color it. The Sun: The Sun is not a planet but a star. It seems bigger, brighter, and hotter than the stars we see at n ...
... Have your students color the planets on page 7 as described below. You may have to read the descriptions to your students, then see if they can figure out which planet is which and color it. The Sun: The Sun is not a planet but a star. It seems bigger, brighter, and hotter than the stars we see at n ...
Problem set 1 solution
... Similar calculations for a mV = 21 star give F = 1.2 × 10−14 erg cm−2 s−1 and Fλ = 1.4 × 10−16 erg cm−2 s−1 nm−1 . (b) Photon counts We make the approximation that all photons in the V band have the energy corresponding to the central wavelength of 550nm: Eγ = hc/(550nm) = 3.6 × 10−12 erg. (Note: To ...
... Similar calculations for a mV = 21 star give F = 1.2 × 10−14 erg cm−2 s−1 and Fλ = 1.4 × 10−16 erg cm−2 s−1 nm−1 . (b) Photon counts We make the approximation that all photons in the V band have the energy corresponding to the central wavelength of 550nm: Eγ = hc/(550nm) = 3.6 × 10−12 erg. (Note: To ...
Habitability
... • Sun’s luminosity has been changing: earlier in its evolution, luminosity was only 70% of what it is today (how could temperature be maintained over geological time) • Future for luminosity – Remember life cycle of stars – In another 2-3 BY, luminosity will place Earth outside habitability zone – M ...
... • Sun’s luminosity has been changing: earlier in its evolution, luminosity was only 70% of what it is today (how could temperature be maintained over geological time) • Future for luminosity – Remember life cycle of stars – In another 2-3 BY, luminosity will place Earth outside habitability zone – M ...
Introduction to Celestial Spheres (Professor Powerpoint)
... •There are roughly 6000 or so stars visible to the naked eye Orion: Aresince these stars in the sky or, 3000 you can only physically see about one half of the sky. ...
... •There are roughly 6000 or so stars visible to the naked eye Orion: Aresince these stars in the sky or, 3000 you can only physically see about one half of the sky. ...
Structure of Neutron Stars
... Kv – observed semi-amplitude of line of sight velocity of the normal star (in km/s), P – orbital period (in days), e – orbital eccentricity, i – orbital inclination (the angle between the prbital plane and line of sight). ...
... Kv – observed semi-amplitude of line of sight velocity of the normal star (in km/s), P – orbital period (in days), e – orbital eccentricity, i – orbital inclination (the angle between the prbital plane and line of sight). ...
Resources - gmu ttac - George Mason University
... the Earth affects the temperature on Earth — i.e., the more direct the rays are, the more light and heat are absorbed and the higher the temperature becomes. In summer, when the sun is high in the sky at noon, its rays strike Earth almost perpendicular to the surface, because light travels in straig ...
... the Earth affects the temperature on Earth — i.e., the more direct the rays are, the more light and heat are absorbed and the higher the temperature becomes. In summer, when the sun is high in the sky at noon, its rays strike Earth almost perpendicular to the surface, because light travels in straig ...
Unit 11: Astronomy
... not moving. Use an arrow to indicate the direction that the spectrum would appear to shift if the object was moving toward you. 2. The graphic to the right shows the spectral lines emitted by four moving objects. The spectral lines for when the object is stationary are shown as dotted lines on each ...
... not moving. Use an arrow to indicate the direction that the spectrum would appear to shift if the object was moving toward you. 2. The graphic to the right shows the spectral lines emitted by four moving objects. The spectral lines for when the object is stationary are shown as dotted lines on each ...
here - ESA Science
... Information from Hipparcos has enabled astronomers to trace the Sun’s passage through the Galaxy back in time. This has shown that over the last 500 million years the Sun has passed through four of the Milky Way’s spiral arms. The times that these traverses occurred appear to coincide with extended ...
... Information from Hipparcos has enabled astronomers to trace the Sun’s passage through the Galaxy back in time. This has shown that over the last 500 million years the Sun has passed through four of the Milky Way’s spiral arms. The times that these traverses occurred appear to coincide with extended ...
Space BootCamp5.8D_Part1_AC
... the Earth and the moon have different gases in their atmosphere there is more water on the surface of the Earth than on the moon a great deal of the Earth is covered by water, but there is none on the moon there are many more clouds surrounding the Earth than around the moon ...
... the Earth and the moon have different gases in their atmosphere there is more water on the surface of the Earth than on the moon a great deal of the Earth is covered by water, but there is none on the moon there are many more clouds surrounding the Earth than around the moon ...
Earth and Space - Pearson SuccessNet
... the phases of the moon. The moon does not really change shape. It is always shaped like a ball. From Earth, you see only the part of the moon that is lighted by the sun. As the moon moves around Earth, different amounts of its lighted side face Earth. When the lighted half of the moon faces Earth, i ...
... the phases of the moon. The moon does not really change shape. It is always shaped like a ball. From Earth, you see only the part of the moon that is lighted by the sun. As the moon moves around Earth, different amounts of its lighted side face Earth. When the lighted half of the moon faces Earth, i ...
holiday lights - Denver Astronomical Society
... border of Corona Australis and Telescopium on February 1st before beginning a rapid northward and was used by Isaac Newton to verify Kepler’s Laws. Its orbit was similar to that of ISON, sugrise. On March 10th, when at its brightest (pre- gesting that it may be similarly bright if all goes well. dic ...
... border of Corona Australis and Telescopium on February 1st before beginning a rapid northward and was used by Isaac Newton to verify Kepler’s Laws. Its orbit was similar to that of ISON, sugrise. On March 10th, when at its brightest (pre- gesting that it may be similarly bright if all goes well. dic ...
101 Science Misconceptions
... #39 - Ben Franklin’s kite was struck by lightning. Amazingly, textbooks and encyclopedias are still reprinting this as fact when it should be obvious that anyone who is holding a kite that is struck by lightning would be, at best, severely injured. Franklin did head out into a thunderstorm with a ki ...
... #39 - Ben Franklin’s kite was struck by lightning. Amazingly, textbooks and encyclopedias are still reprinting this as fact when it should be obvious that anyone who is holding a kite that is struck by lightning would be, at best, severely injured. Franklin did head out into a thunderstorm with a ki ...
Chapter 2 Measuring the Earth
... What is meant by the contour “interval” on a topographic map? a. time between two lines b. space between two lines c. vertical height between two lines d. miles between two lines The contour lines on a section of map being interpreted appear much closer together than elsewhere on the same map. The c ...
... What is meant by the contour “interval” on a topographic map? a. time between two lines b. space between two lines c. vertical height between two lines d. miles between two lines The contour lines on a section of map being interpreted appear much closer together than elsewhere on the same map. The c ...
1 THE SMALL SATELLITES OF THE SOLAR SYSTEM: A WHITE
... should include observations during SOI of Phoebe, and if possible one or more of the outermost satellites. The required observations include visible and IR spectroscopy to determine their composition, and imaging to determine size, crater frequency, and geologic history. Another important area is th ...
... should include observations during SOI of Phoebe, and if possible one or more of the outermost satellites. The required observations include visible and IR spectroscopy to determine their composition, and imaging to determine size, crater frequency, and geologic history. Another important area is th ...
Branches of Earth Science Tools Used to Study Stars Constellations
... Galaxy is a huge collection of stars bound by gravity o Contain various star groups Billions of galaxies in the universe 3 types of galaxies o Spiral o Elliptical o Irregular ...
... Galaxy is a huge collection of stars bound by gravity o Contain various star groups Billions of galaxies in the universe 3 types of galaxies o Spiral o Elliptical o Irregular ...
Formation and evolution of the Solar System
The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.