Lookback Time in Our Everyday Lives
... Stellar distances and the 3D nature of the heavens We use the Astronomical Unit as our unit of length for measuring distances in the Solar System. However, because stellar distances are so large, astronomers use another unit of length, the light-year (ly). The light-year is defined as the distance ...
... Stellar distances and the 3D nature of the heavens We use the Astronomical Unit as our unit of length for measuring distances in the Solar System. However, because stellar distances are so large, astronomers use another unit of length, the light-year (ly). The light-year is defined as the distance ...
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The Solar System and its Place in the Galaxy
... encounters with giant molecular clouds in the galactic disk. Thus, older stars can be accelerated to higher mean velocities, as noted earlier. The reason(s) for the Sun's low velocity are not known. Velocity-altering encounters with giant molecular clouds occur with a typical frequency of once every ...
... encounters with giant molecular clouds in the galactic disk. Thus, older stars can be accelerated to higher mean velocities, as noted earlier. The reason(s) for the Sun's low velocity are not known. Velocity-altering encounters with giant molecular clouds occur with a typical frequency of once every ...
jackie822 beanerbutt777 life cycle of a star
... http://solarsystem.nasa.gov/multimedia/gallery/prominence.gif ...
... http://solarsystem.nasa.gov/multimedia/gallery/prominence.gif ...
HR Diagram Explorer Worksheet
... Open the HR Diagram Explorer. Begin by familiarizing yourself with the capabilities of the HertzsprungRussell Diagram Explorer through experimentation. An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around ...
... Open the HR Diagram Explorer. Begin by familiarizing yourself with the capabilities of the HertzsprungRussell Diagram Explorer through experimentation. An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around ...
Image Credit: NASA,ESA, HEIC, Hubble
... – Protostars only around for short time (few million years) ...
... – Protostars only around for short time (few million years) ...
Lecture 6: Stellar Distances and Brightness
... They exist! (which is good, since we can’t measure parallaxes for that many stars, and certainly not for stars outside the Milky Way) But they are indirect, and rely on assumptions such as: This star has the same luminosity as the Sun This star has the luminosity given by a model We will return to t ...
... They exist! (which is good, since we can’t measure parallaxes for that many stars, and certainly not for stars outside the Milky Way) But they are indirect, and rely on assumptions such as: This star has the same luminosity as the Sun This star has the luminosity given by a model We will return to t ...
star - Cloudfront.net
... 2a. Students know why the solar system is located in an outer edge of the disc-shaped Milky Way galaxy, which spans 100,000 light years. 2b. Students know galaxies are made of billions of stars and comprise most of the visible mass of the universe. 2c. Students know the evidence indicating that all ...
... 2a. Students know why the solar system is located in an outer edge of the disc-shaped Milky Way galaxy, which spans 100,000 light years. 2b. Students know galaxies are made of billions of stars and comprise most of the visible mass of the universe. 2c. Students know the evidence indicating that all ...
Standard candles
... white dwarf star in a binary pair with a red dwarf star steals mass from the red dwarf until it is too massive to support itself against gravity any more. Then its core collapses, starting a runaway nuclear reaction and a bright explosion. Because the collapse always happens at the same mass, the lu ...
... white dwarf star in a binary pair with a red dwarf star steals mass from the red dwarf until it is too massive to support itself against gravity any more. Then its core collapses, starting a runaway nuclear reaction and a bright explosion. Because the collapse always happens at the same mass, the lu ...
Chemical Universe. - University of Texas Astronomy
... star’s outer layers blow off into space, forming a beautiful cloud of gas and dust known as a planetary nebula. The star’s leftover core, at the heart of the nebula, becomes a white dwarf — a ball of matter only about as big as Earth, but containing most of the star’s mass. It no longer produces ene ...
... star’s outer layers blow off into space, forming a beautiful cloud of gas and dust known as a planetary nebula. The star’s leftover core, at the heart of the nebula, becomes a white dwarf — a ball of matter only about as big as Earth, but containing most of the star’s mass. It no longer produces ene ...
ASTR 340 - TerpConnect
... stars called galaxy (Fig.2.2 & 2.3). The stars of the galaxy revolve about its center as the planets revolve about the Sun. The Sun itself participates in its rotating motion, with a period of 2 108 years. The galaxy is flattened by its rotation to a pancake like disk whose thickness is roughly 1/ ...
... stars called galaxy (Fig.2.2 & 2.3). The stars of the galaxy revolve about its center as the planets revolve about the Sun. The Sun itself participates in its rotating motion, with a period of 2 108 years. The galaxy is flattened by its rotation to a pancake like disk whose thickness is roughly 1/ ...
Tyler Gray - Angelfire
... M31 is the famous Andromeda galaxy, our nearest large neighbor galaxy, forming the Local Group of galaxies together with its companions (including M32 and M110, two bright dwarf elliptical galaxies), our Milky Way and its companions, M33, and others. Visible to the naked eye even under moderate cond ...
... M31 is the famous Andromeda galaxy, our nearest large neighbor galaxy, forming the Local Group of galaxies together with its companions (including M32 and M110, two bright dwarf elliptical galaxies), our Milky Way and its companions, M33, and others. Visible to the naked eye even under moderate cond ...
Surveys of Stars, The interstellar medium
... Mass is the single most important property in how a star’s life and death will proceed. ...
... Mass is the single most important property in how a star’s life and death will proceed. ...
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... and phases of the Moon as well as additional topics that will be mentioned throughout this book. It takes a lot of consideration to decide how to use such materials, but research shows that it will benefit most students for the classroom to be more learner-centered. ...
... and phases of the Moon as well as additional topics that will be mentioned throughout this book. It takes a lot of consideration to decide how to use such materials, but research shows that it will benefit most students for the classroom to be more learner-centered. ...
Star Formation
... blown away, but its thermal energy comes from gravitational contraction, not fusion • Contraction must continue until the core becomes hot enough for nuclear fusion ...
... blown away, but its thermal energy comes from gravitational contraction, not fusion • Contraction must continue until the core becomes hot enough for nuclear fusion ...
20_LectureOutline
... as it would have if they were not companions. If they are closer, it is possible for material to transfer from one star to another, leading to ...
... as it would have if they were not companions. If they are closer, it is possible for material to transfer from one star to another, leading to ...
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.