The Milky Way`s Spiral Arms
... Spiral arms are patterns • According to the density-wave theory, spiral arms are created by density waves that sweep around the Galaxy • The gravitational field of this spiral pattern causes stars and gas to slow down near the arm • This compresses the interstellar clouds, triggering the formation ...
... Spiral arms are patterns • According to the density-wave theory, spiral arms are created by density waves that sweep around the Galaxy • The gravitational field of this spiral pattern causes stars and gas to slow down near the arm • This compresses the interstellar clouds, triggering the formation ...
File
... this is why they appear red to our eyes. This color is also seen in red giant stars which are larger in size and they are still colder. Station 3: Blue (Sirius & Vega) ...
... this is why they appear red to our eyes. This color is also seen in red giant stars which are larger in size and they are still colder. Station 3: Blue (Sirius & Vega) ...
Chapter 16
... 1. The density wave theory was first proposed by Lindblad in 1960. It is a model for spiral galaxies that proposes that the arms are the result of density waves sweeping around the galaxy. 2. A density wave is a wave in which areas of high and low pressure move through the medium. 3. The density wav ...
... 1. The density wave theory was first proposed by Lindblad in 1960. It is a model for spiral galaxies that proposes that the arms are the result of density waves sweeping around the galaxy. 2. A density wave is a wave in which areas of high and low pressure move through the medium. 3. The density wav ...
Your Place in Space and Time
... This image shows the locations of nearby stars; stars would be atom-sized on this scale, so their sizes have been greatly exaggerated for visibility. Zooming in on a tiny piece of the Milky Way brings us to the nearby stars of our local solar neighborhood. While we see only stars, we now know that m ...
... This image shows the locations of nearby stars; stars would be atom-sized on this scale, so their sizes have been greatly exaggerated for visibility. Zooming in on a tiny piece of the Milky Way brings us to the nearby stars of our local solar neighborhood. While we see only stars, we now know that m ...
Astronomy and the Universe - Department of Physics and Astronomy
... What are the stars? Do they last forever? What are galaxies? What do astronomers learn by studying them? How does measuring angles help astronomers learn about objects in the sky? What is powers-of-ten notation, and why is it useful in ...
... What are the stars? Do they last forever? What are galaxies? What do astronomers learn by studying them? How does measuring angles help astronomers learn about objects in the sky? What is powers-of-ten notation, and why is it useful in ...
types of stars, luminosity, and brightness
... intrinsic energy per sec that a star radiates and does not depend on our distance from the star. 7. Stars are classified by temperature and luminosity. 8. Supergiants are the most luminous and white dwarfs are the least luminous. 9. The main characteristic of main sequence stars is that they have hy ...
... intrinsic energy per sec that a star radiates and does not depend on our distance from the star. 7. Stars are classified by temperature and luminosity. 8. Supergiants are the most luminous and white dwarfs are the least luminous. 9. The main characteristic of main sequence stars is that they have hy ...
Astronomy 102, Spring 2003 Solutions to Review Problems
... to be careful to convert solar masses to kilograms properly. This is tiny! It’s neary 30 million times smaller than the 3 km radius we heard about for the Sun. This is not surprising, because 3.74 × 10−8 is about 1/30 million. . . i.e. the Moon is one thirty-millionth the mass of the Sun, so the siz ...
... to be careful to convert solar masses to kilograms properly. This is tiny! It’s neary 30 million times smaller than the 3 km radius we heard about for the Sun. This is not surprising, because 3.74 × 10−8 is about 1/30 million. . . i.e. the Moon is one thirty-millionth the mass of the Sun, so the siz ...
The Milky Way Galaxy
... edge of the system, I find no more fainter stars. By repeating this procedure along all directions, I can get an idea of the shape of the stellar system. Once I measure the distance to the stars, I also estimate the size. Herschel and Kapteyn did just that and other things, and concluded that the Ga ...
... edge of the system, I find no more fainter stars. By repeating this procedure along all directions, I can get an idea of the shape of the stellar system. Once I measure the distance to the stars, I also estimate the size. Herschel and Kapteyn did just that and other things, and concluded that the Ga ...
Ch 3 PPT - Blountstown Middle School
... Lesson 1: The View from Earth • The sky is divided into 88 constellations. • Astronomers learn about the energy, distance, temperature, and composition of stars by studying their light. • Astronomers measure distances in space in astrological units and in light-years. They measure star brightness a ...
... Lesson 1: The View from Earth • The sky is divided into 88 constellations. • Astronomers learn about the energy, distance, temperature, and composition of stars by studying their light. • Astronomers measure distances in space in astrological units and in light-years. They measure star brightness a ...
NASAexplores 9-12 Lesson: Classified Stars - Science
... bluest stars appear on the left, and the reddest stars on the right. The stars that appear near the top of the chart are the brightest and those toward the bottom are the faintest. The hottest stars are plotted at the far left and the coolest stars appear at the far right. Of course, this diagram do ...
... bluest stars appear on the left, and the reddest stars on the right. The stars that appear near the top of the chart are the brightest and those toward the bottom are the faintest. The hottest stars are plotted at the far left and the coolest stars appear at the far right. Of course, this diagram do ...
Star Formation
... • Interstellar gas, like the sun, is 74% hydrogen and 25% helium. • Interstellar dust, like clouds in the gas giants, are molecular carbon monoxide, ammonia, and water. • Traces of all other elements are present. ...
... • Interstellar gas, like the sun, is 74% hydrogen and 25% helium. • Interstellar dust, like clouds in the gas giants, are molecular carbon monoxide, ammonia, and water. • Traces of all other elements are present. ...
Measuring the Properties of Stars
... (m + M)P2 = a3 is a useful equation for determining total mass of a binary system when measurements of the separation between the primary and secondary bodies, and the calculation of the period of revolution of the secondary body about the primary body can be made. Actually, this equation can determ ...
... (m + M)P2 = a3 is a useful equation for determining total mass of a binary system when measurements of the separation between the primary and secondary bodies, and the calculation of the period of revolution of the secondary body about the primary body can be made. Actually, this equation can determ ...
Apparent Magnitude
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
The origin, life, and death of stars
... More massive stars have greater gravity, and this speeds up the rate of fusion O and B stars can consume all of their core hydrogen in a few million years, while very low mass stars can take hundreds of billions of years. ...
... More massive stars have greater gravity, and this speeds up the rate of fusion O and B stars can consume all of their core hydrogen in a few million years, while very low mass stars can take hundreds of billions of years. ...
Binary Stars
... But (from ASTR 101) remember how rare the transits of Venus are: once a century or so. We would see more frequent transits if Venus was much closer to the Sun. ...
... But (from ASTR 101) remember how rare the transits of Venus are: once a century or so. We would see more frequent transits if Venus was much closer to the Sun. ...
Sequencing the Stars
... seem to be too bright. These are nearby stars that don’t belong to the globular cluster but just happen to be in the field of view. I like globular clusters so much that I tend to revisit my favorites each year and retake their picture. Hence, I can compare pairs of HR-diagrams of the same cluster t ...
... seem to be too bright. These are nearby stars that don’t belong to the globular cluster but just happen to be in the field of view. I like globular clusters so much that I tend to revisit my favorites each year and retake their picture. Hence, I can compare pairs of HR-diagrams of the same cluster t ...
Life Cycle of a Star
... • All stars begin as parts of nebulas • A large cloud of gas and dust • large amount of gas in a small volume, ...
... • All stars begin as parts of nebulas • A large cloud of gas and dust • large amount of gas in a small volume, ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.