Space ppt
... • Our star (Sun), the planets, many moons, and other small bodies that ALL travel around the Sun. ...
... • Our star (Sun), the planets, many moons, and other small bodies that ALL travel around the Sun. ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... Combine parallax and brightness Canopus has twice the parallax of Spica. Since distance α 1 / parallax, Spica must be at twice the distance of Canopus. (The numbers are 100 pc and 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant a ...
... Combine parallax and brightness Canopus has twice the parallax of Spica. Since distance α 1 / parallax, Spica must be at twice the distance of Canopus. (The numbers are 100 pc and 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant a ...
Chapter 11: Stars
... • We observe the apparent brightness of stars. • To determine the luminosities (total energy output per second), we need to know the distances to stars. • How do we measure the distances to stars? ...
... • We observe the apparent brightness of stars. • To determine the luminosities (total energy output per second), we need to know the distances to stars. • How do we measure the distances to stars? ...
Hertzsprung2 - courses.psu.edu
... Stellar Classification: Spectral Types * Stars classified according to appearance of spectrum. * Originally believed differences due to composition – Not! ...
... Stellar Classification: Spectral Types * Stars classified according to appearance of spectrum. * Originally believed differences due to composition – Not! ...
Chapter 21 Study Guide
... 12. A building that contains one or more telescopes is called an _____________________________. 13. Name one reason why astronomers have built large telescopes on the tops of mountains. _____________________________________________________________________________________ 14. The Hubble Space Telesco ...
... 12. A building that contains one or more telescopes is called an _____________________________. 13. Name one reason why astronomers have built large telescopes on the tops of mountains. _____________________________________________________________________________________ 14. The Hubble Space Telesco ...
Lecture18
... The period is easy to measure and give the astronomer the luminosity of the star Using the luminosity and the apparent brightness, the astronomer can calculate the distance to the star The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the bri ...
... The period is easy to measure and give the astronomer the luminosity of the star Using the luminosity and the apparent brightness, the astronomer can calculate the distance to the star The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the bri ...
hea-www.harvard.edu
... Measure peak in presence of noise Measure integral under curve in presence of noise and model assumptions ...
... Measure peak in presence of noise Measure integral under curve in presence of noise and model assumptions ...
It all began with a Big Bang!
... • The Sun is a star. Like most stars, the Sun is a ball of very hot gas that gives off huge amounts of light, heat and other radiation. • There are many different types of star. Red stars are the coolest. Blue-white stars are the hottest. Yellow stars like the Sun are in-between ...
... • The Sun is a star. Like most stars, the Sun is a ball of very hot gas that gives off huge amounts of light, heat and other radiation. • There are many different types of star. Red stars are the coolest. Blue-white stars are the hottest. Yellow stars like the Sun are in-between ...
Poor Pluto - Leslie Looney
... •! Dim, diffuse, “interstellar” nebulae with spiral structure were seen in the 17th century. •! Some disagreement on what they were. ...
... •! Dim, diffuse, “interstellar” nebulae with spiral structure were seen in the 17th century. •! Some disagreement on what they were. ...
The Milky Way
... 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 ...
Goal: To understand how to find the brightness of stars and what
... • So, instead of 1,2,3, we go by X1, X2,X3. • X can be anything. • For stars, X is about 2.5. • So, 5 orders of magnitude is a factor of 2.55 (which turns out to be about a factor of 100) • Some scales also have logarithmic scales for ...
... • So, instead of 1,2,3, we go by X1, X2,X3. • X can be anything. • For stars, X is about 2.5. • So, 5 orders of magnitude is a factor of 2.55 (which turns out to be about a factor of 100) • Some scales also have logarithmic scales for ...
AST121 Introduction to Astronomy
... – one set of absorption lines are too faint to be seen – analyze doppler shift in the aborption lines of one star, thus measuring its “wobble” and then calculate the properties of the other star. – similar to how we discover extrasolar planets ...
... – one set of absorption lines are too faint to be seen – analyze doppler shift in the aborption lines of one star, thus measuring its “wobble” and then calculate the properties of the other star. – similar to how we discover extrasolar planets ...
Study Guide Astronomy Chapter 1
... Other telescopes for other frequencies Put ultraviolet, x-ray, and gamma ray telescopes in orbit as our atmosphere blocks out most of these rays Linking radio telescopes makes them act as one larger more powerful telescope Light pollution, water vapor, and atmospheric interference on earth limits vi ...
... Other telescopes for other frequencies Put ultraviolet, x-ray, and gamma ray telescopes in orbit as our atmosphere blocks out most of these rays Linking radio telescopes makes them act as one larger more powerful telescope Light pollution, water vapor, and atmospheric interference on earth limits vi ...
Answers to Final Exam – Study Guide
... (final velocity – initial velocity) / time o 101. The metric unit for temperature is the Celsius or Kelvin 102. What color are the coldest stars red 103. The metric prefix milli means ...
... (final velocity – initial velocity) / time o 101. The metric unit for temperature is the Celsius or Kelvin 102. What color are the coldest stars red 103. The metric prefix milli means ...
White Dwarf Stars
... B. The Universe expanded faster than the speed of light in its very early phases C. The expansion is now slowing down because of the mutual gravitational attraction of galaxies in the Universe D. The effects of dark matter are dominant over the effects of dark energy today E. There is more anti-matt ...
... B. The Universe expanded faster than the speed of light in its very early phases C. The expansion is now slowing down because of the mutual gravitational attraction of galaxies in the Universe D. The effects of dark matter are dominant over the effects of dark energy today E. There is more anti-matt ...
The universe - Villanova University
... Less and less fuel, core contracts, outer layers expand. “Nova” and planetary nebula, leaving a white dwarf behind. ...
... Less and less fuel, core contracts, outer layers expand. “Nova” and planetary nebula, leaving a white dwarf behind. ...
Components of the Universe Test Review
... Which unit would you use to best measure distances in the solar system? ...
... Which unit would you use to best measure distances in the solar system? ...
types of stars, luminosity, and brightness
... 5. The absolute brightness is the brightness that would be measured at a standard distance of 10 pc. Apparent brightness is the brightness of a star measured from Earth. 6. Absolute brightness is the luminosity of a star as it would be measured at 10 pc. Luminosity is the intrinsic energy per sec th ...
... 5. The absolute brightness is the brightness that would be measured at a standard distance of 10 pc. Apparent brightness is the brightness of a star measured from Earth. 6. Absolute brightness is the luminosity of a star as it would be measured at 10 pc. Luminosity is the intrinsic energy per sec th ...
Chapter 6: Terrestrial Planets - Department of Physics and Astronomy
... radial velocity curve (not shown), we can calculate stars’ radii, relative temperatures, combined masses and mass ratios ...
... radial velocity curve (not shown), we can calculate stars’ radii, relative temperatures, combined masses and mass ratios ...
Foundation 1 - Discovering Astronomy
... 2: Identify the defining characteristic of main-sequence stars and compare the relative lifetimes on the main sequence for stars of different mass. 3: List the names of nuclear fusion reactions and indicate the classes of stars in which each reaction is thought to be active. 4: Identify the physical ...
... 2: Identify the defining characteristic of main-sequence stars and compare the relative lifetimes on the main sequence for stars of different mass. 3: List the names of nuclear fusion reactions and indicate the classes of stars in which each reaction is thought to be active. 4: Identify the physical ...
Unit 49-59 Review
... 22. If the surface temperature of a star is doubled, but its radius remains the same, its new luminosity is _____________ its old luminosity. a. 16 times smaller b. 4 times smaller c. the same as d. 4 times larger than e. 16 times larger than 23. The Stefan-Boltzmann Law applies to a. Individual ato ...
... 22. If the surface temperature of a star is doubled, but its radius remains the same, its new luminosity is _____________ its old luminosity. a. 16 times smaller b. 4 times smaller c. the same as d. 4 times larger than e. 16 times larger than 23. The Stefan-Boltzmann Law applies to a. Individual ato ...
The Chemical Composition of Stars in Open Clusters
... able to study clusters at distances of up to 6 kpc or so. Recent work has shown that large-scale abundance gradients are indeed present in the disko I may refer again to the work of Mayor, who found a decrease of the metal abundance by a factor of 2 over a distance of 3 kpc in the radial direction. ...
... able to study clusters at distances of up to 6 kpc or so. Recent work has shown that large-scale abundance gradients are indeed present in the disko I may refer again to the work of Mayor, who found a decrease of the metal abundance by a factor of 2 over a distance of 3 kpc in the radial direction. ...
main-sequence stars
... Absolute magnitude is a measure of how bright a star would be if all stars were at the same distance (ten parsecs) from Earth. Thus, distance from Earth no longer becomes a factor in how bright a star is. Remember, very bright stars that are very far from Earth may appear to be very faint to us. For ...
... Absolute magnitude is a measure of how bright a star would be if all stars were at the same distance (ten parsecs) from Earth. Thus, distance from Earth no longer becomes a factor in how bright a star is. Remember, very bright stars that are very far from Earth may appear to be very faint to us. For ...
AST301.Ch21.StellarExpl - University of Texas Astronomy
... different elements, from H, He,…to uranium, lead,… come from? Except for H and He, they come from stellar nucleosynthesis: nuclear fusion in stars. Look at the pattern of abundances of elements as a function of their atomic weight in Fig. 21.13 (p. 556). You can see that the heavier elements are les ...
... different elements, from H, He,…to uranium, lead,… come from? Except for H and He, they come from stellar nucleosynthesis: nuclear fusion in stars. Look at the pattern of abundances of elements as a function of their atomic weight in Fig. 21.13 (p. 556). You can see that the heavier elements are les ...
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.