Note Taking Guide #2: Characteristics of Stars Welcome back! As
... A star’s apparent magnitude is how much light a star appears to give off when viewed from Earth. The closer a star is to Erath, the more light it appears to give off. Think of our sun versus Alpha Centauri; the sun appears to give off much more light, even though the two stars are actually very simi ...
... A star’s apparent magnitude is how much light a star appears to give off when viewed from Earth. The closer a star is to Erath, the more light it appears to give off. Think of our sun versus Alpha Centauri; the sun appears to give off much more light, even though the two stars are actually very simi ...
Galaxies and the Universe
... • There is only one • You are part of it too! • We see it as it was in the past • Contains many other galaxies • Most of it is empty space ...
... • There is only one • You are part of it too! • We see it as it was in the past • Contains many other galaxies • Most of it is empty space ...
Astronomical terms and constants
... ≈ 1.4 × 1010 years = Hubble time, approximate age of the universe. 0 = dH c Units of mass M⊙ = 2 × 1033 g = solar mass. Known stars have masses in the range 0.08 − 100 M⊙ . Below about 0.08 M⊙ the objects are brown dwarfs. Units of luminosity, magnitudes L⊙ = 4 × 1033 erg s−1 = solar luminosity. Kno ...
... ≈ 1.4 × 1010 years = Hubble time, approximate age of the universe. 0 = dH c Units of mass M⊙ = 2 × 1033 g = solar mass. Known stars have masses in the range 0.08 − 100 M⊙ . Below about 0.08 M⊙ the objects are brown dwarfs. Units of luminosity, magnitudes L⊙ = 4 × 1033 erg s−1 = solar luminosity. Kno ...
Name
... The apparent magnitude of stars was first recorded by the Greek astronomer Hipparchus about 160 B.C. Hipparchus grouped stars according to their brightness or magnitude. He called the twenty brightest stars first magnitude stars. Stars half that bright were second magnitude. Third magnitude stars we ...
... The apparent magnitude of stars was first recorded by the Greek astronomer Hipparchus about 160 B.C. Hipparchus grouped stars according to their brightness or magnitude. He called the twenty brightest stars first magnitude stars. Stars half that bright were second magnitude. Third magnitude stars we ...
Slayt 1
... • But how did these elements came into our body? • What happens to a star after it exhausts all ...
... • But how did these elements came into our body? • What happens to a star after it exhausts all ...
Astronomy review - Petal School District
... (no man has ever been farther than the moon) One way: space telescopes! the Hubble Space Telescope (looks at distant galaxies & at planets in our solar system) ...
... (no man has ever been farther than the moon) One way: space telescopes! the Hubble Space Telescope (looks at distant galaxies & at planets in our solar system) ...
Milky Way - Wayne Hu`s Tutorials
... • Mapping out the Universe marching out in distance from Earth Start with closest system: Galaxy End with furthest system: whole Universe • Limitations imposed by the ability to measure only a handful of quantities, all from our vantage point in the Galaxy Common tools: flux and surface brightness, ...
... • Mapping out the Universe marching out in distance from Earth Start with closest system: Galaxy End with furthest system: whole Universe • Limitations imposed by the ability to measure only a handful of quantities, all from our vantage point in the Galaxy Common tools: flux and surface brightness, ...
Ginger Dublin 6th Grade Science
... the unaided eye. Distance can cause a dimmer star to appear to be brighter than a brighter star that is farther away. • Absolute Magnitude: The amount of light (brightness) a star actually has. This is an actual measurement. ...
... the unaided eye. Distance can cause a dimmer star to appear to be brighter than a brighter star that is farther away. • Absolute Magnitude: The amount of light (brightness) a star actually has. This is an actual measurement. ...
What is a Star?
... 40 trillion km from the sun. (more than 260,000AU) • Light takes 4.2 years to reach Earth. ...
... 40 trillion km from the sun. (more than 260,000AU) • Light takes 4.2 years to reach Earth. ...
Study Guide 4 Part A Outline
... o Elliptical galaxies contain mainly old stars and have little interstellar gas o Spiral galaxies are similar to the Milky Way and have both young and old stars. o The Milky Way is in a small group of galaxies called the Local Group, but giant clusters of galaxies also exist o As we look through the ...
... o Elliptical galaxies contain mainly old stars and have little interstellar gas o Spiral galaxies are similar to the Milky Way and have both young and old stars. o The Milky Way is in a small group of galaxies called the Local Group, but giant clusters of galaxies also exist o As we look through the ...
What`s a Parsec? - The Sky This Week
... meters per second, exactly. In fact, this speed defines the exact length of a meter. The speed of light in terms you may be more familiar with is 186,282.4 miles per second, or a whopping 671 million miles per hour. Even so, the nearest known star beyond our solar system, Proxima Centauri, is 4.23 ± ...
... meters per second, exactly. In fact, this speed defines the exact length of a meter. The speed of light in terms you may be more familiar with is 186,282.4 miles per second, or a whopping 671 million miles per hour. Even so, the nearest known star beyond our solar system, Proxima Centauri, is 4.23 ± ...
Cells The Basic Unit of Life
... kilometres in length. These celestial wonders of ice, cock, and organic compounds travel around the Sun in elongated orbits called an _________________. In 1997, Hale-Bopp was one of the most brilliant to recently enter the inner solar system, and was visible to the unaided eye for months. However, ...
... kilometres in length. These celestial wonders of ice, cock, and organic compounds travel around the Sun in elongated orbits called an _________________. In 1997, Hale-Bopp was one of the most brilliant to recently enter the inner solar system, and was visible to the unaided eye for months. However, ...
Stars
... The brightness of a star depends on size and temperature How bright a star looks depends on distance from Earth and actual brightness Apparent magnitude: brightness as seen from Earth Absolute magnitude: brightness if it were a standard distance from Earth ...
... The brightness of a star depends on size and temperature How bright a star looks depends on distance from Earth and actual brightness Apparent magnitude: brightness as seen from Earth Absolute magnitude: brightness if it were a standard distance from Earth ...
Unit 1
... fuzzy and diffuse, due to the vast separation between the Sun and the observed galaxy, as well as the separation between the stars of that galaxy! – The paleness of visible light from distant galaxies is called the surface brightness. ...
... fuzzy and diffuse, due to the vast separation between the Sun and the observed galaxy, as well as the separation between the stars of that galaxy! – The paleness of visible light from distant galaxies is called the surface brightness. ...
8Sept103_2014
... *Subject of astronomy (Units 1--4) *Observations of planets and stars (Units 5--12) *Laws of gravity, dark matter (Units 14-20) *Light, atoms, spectra (Units 21--30) *Stars: Sun as an example (Units 49--50) *Learning about stars (Units 52--55) *Birth and evolution of stars (Units 56—63, 69) *When th ...
... *Subject of astronomy (Units 1--4) *Observations of planets and stars (Units 5--12) *Laws of gravity, dark matter (Units 14-20) *Light, atoms, spectra (Units 21--30) *Stars: Sun as an example (Units 49--50) *Learning about stars (Units 52--55) *Birth and evolution of stars (Units 56—63, 69) *When th ...
Name____________________________________________
... 3. What is a galaxy? A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 4. What does an elliptical galaxy look like? Round or flattened ball; smashed circle 5. The Milky Way Galaxy is just one of billions of galaxies in the universe. 6. Our Solar Syst ...
... 3. What is a galaxy? A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 4. What does an elliptical galaxy look like? Round or flattened ball; smashed circle 5. The Milky Way Galaxy is just one of billions of galaxies in the universe. 6. Our Solar Syst ...
Climbing the Cosmic Distance Ladder: How Astronomers Measure
... Distances to very distant stars • This gave a way to obtain the absolute brightness for these stars, and hence observed distances. • Because Cepheids are so bright, this method works up to 13,000,000 light years, well beyond the Milky Way! Most galaxies are fortunate to have at least one ...
... Distances to very distant stars • This gave a way to obtain the absolute brightness for these stars, and hence observed distances. • Because Cepheids are so bright, this method works up to 13,000,000 light years, well beyond the Milky Way! Most galaxies are fortunate to have at least one ...
Luminosities and magnitudes of stars
... encompassing the source (units watts) Luminosity L = IdAdd If source (star) radiates isotropically, its radiation at distance r is evenly distributed on a spherical surface of area 4 r2 Flux is then F = L / 4 r2 (w m-2) Fig 4.3. An energy flux, which, at distance r from a point source, i ...
... encompassing the source (units watts) Luminosity L = IdAdd If source (star) radiates isotropically, its radiation at distance r is evenly distributed on a spherical surface of area 4 r2 Flux is then F = L / 4 r2 (w m-2) Fig 4.3. An energy flux, which, at distance r from a point source, i ...
The Milky Way – A Classic Galaxy
... Udalski et al. 2001), as long as one uses infrared luminosities. This is what modern astronomers do. (in the old days, before IR technology, this issue caused a lot of confusion in using Cepheids as distance indicators!) ...
... Udalski et al. 2001), as long as one uses infrared luminosities. This is what modern astronomers do. (in the old days, before IR technology, this issue caused a lot of confusion in using Cepheids as distance indicators!) ...
Stars and Galaxies
... It may take several years for a spacecraft to reach other planets in our solar system. It may take several centuries to reach other stars in our galaxy. ...
... It may take several years for a spacecraft to reach other planets in our solar system. It may take several centuries to reach other stars in our galaxy. ...
Telescopes (continued). Properties of Stars.
... visible region, we can calculate only the visiblelight luminosity. ...
... visible region, we can calculate only the visiblelight luminosity. ...
3 sr -1
... 1 mag. difference gives a factor of 2.512 in apparent brightness (larger magnitude = fainter object!) 1st mag. stars appear 100 times brighter than 6th mag. stars ...
... 1 mag. difference gives a factor of 2.512 in apparent brightness (larger magnitude = fainter object!) 1st mag. stars appear 100 times brighter than 6th mag. stars ...
How Bright is that Star?
... A 1st magnitude star is 100x brighter than a “6th ” Each order of magnitude is therefore 2.15 times brighter than the one below it. Magnitude is now given in decimal form. Deneb now rates a 1.26, and Betelgeuse rates .87. Hipparchus underestimated how bright the brightest were, so now we even use ne ...
... A 1st magnitude star is 100x brighter than a “6th ” Each order of magnitude is therefore 2.15 times brighter than the one below it. Magnitude is now given in decimal form. Deneb now rates a 1.26, and Betelgeuse rates .87. Hipparchus underestimated how bright the brightest were, so now we even use ne ...
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.