Cosmology
... Discuss the asteroid belt and the fact that Jupiter’s influence prevents a planet from forming there. Oort cloud and Kuiper belt. Discuss and show Earth’s proposed position in the spiral arm of our galaxy and that the milky way seen from Earth is due to us looking directly at the galactic centre. Di ...
... Discuss the asteroid belt and the fact that Jupiter’s influence prevents a planet from forming there. Oort cloud and Kuiper belt. Discuss and show Earth’s proposed position in the spiral arm of our galaxy and that the milky way seen from Earth is due to us looking directly at the galactic centre. Di ...
Star Evolution
... fusion in their cores. They leave the main sequence and become red giants when the core hydrogen is depleted” ...
... fusion in their cores. They leave the main sequence and become red giants when the core hydrogen is depleted” ...
What is a star?
... They added to the magnitude system. • Today, the brightest stars have a magnitude of about –2, and the faintest stars that we can see with a telescope have a magnitude of +30. • Dim stars have positive (larger) numbers, and bright stars have negative (smaller) numbers. ...
... They added to the magnitude system. • Today, the brightest stars have a magnitude of about –2, and the faintest stars that we can see with a telescope have a magnitude of +30. • Dim stars have positive (larger) numbers, and bright stars have negative (smaller) numbers. ...
BROCK UNIVERSITY Return both the exam script
... (a) the same stars. (b) at least some different stars. (c) [It depends on the time of the month.] (d) [It depends on the time of year.] 29. The celestial sphere (a) is the astronomical version of the Hall of Fame. (b) is a region of the solar system at the outer edge of the Kuiper belt. (c) is the p ...
... (a) the same stars. (b) at least some different stars. (c) [It depends on the time of the month.] (d) [It depends on the time of year.] 29. The celestial sphere (a) is the astronomical version of the Hall of Fame. (b) is a region of the solar system at the outer edge of the Kuiper belt. (c) is the p ...
Document
... J0108-1431 (J0108 for short), located only 770 light years from us. The elongated object immediately to its upper right is a background galaxy that is unrelated to the pulsar. Since J0108 is located a long way from the plane of our galaxy, many distant galaxies are visible in the larger-scale optica ...
... J0108-1431 (J0108 for short), located only 770 light years from us. The elongated object immediately to its upper right is a background galaxy that is unrelated to the pulsar. Since J0108 is located a long way from the plane of our galaxy, many distant galaxies are visible in the larger-scale optica ...
Slide 1
... • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”. ...
... • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”. ...
Today`s Powerpoint
... billions of years to convert p's to 4He in Sun's core. Process sets lifetime of stars. Hydrostatic Equilibrium: pressure from fusion reactions balances gravity. Sun is stable. ...
... billions of years to convert p's to 4He in Sun's core. Process sets lifetime of stars. Hydrostatic Equilibrium: pressure from fusion reactions balances gravity. Sun is stable. ...
Stars, Galaxies, and the Universe Section 3 Stars, Galaxies, and the
... and are held together by gravity. The center of mass, or barycenter, is somewhere between the two stars. • In star systems that have more than two stars, two stars may revolve rapidly around a common barycenter, while a third star revolves more slowly at a greater distance from the pair. • Astronome ...
... and are held together by gravity. The center of mass, or barycenter, is somewhere between the two stars. • In star systems that have more than two stars, two stars may revolve rapidly around a common barycenter, while a third star revolves more slowly at a greater distance from the pair. • Astronome ...
Astronomy Study Guide
... Apparent brightness—the brightness of a star as seen from Earth Absolute brightness—a star’s brightness as if it were a standard distance from Earth Constellation—an imaginary pattern of stars (example—Orion) Hertzsprung - Russell diagram (H-R diagram)—a graph of stars showing surface temperature on ...
... Apparent brightness—the brightness of a star as seen from Earth Absolute brightness—a star’s brightness as if it were a standard distance from Earth Constellation—an imaginary pattern of stars (example—Orion) Hertzsprung - Russell diagram (H-R diagram)—a graph of stars showing surface temperature on ...
the stars
... “Ground"). Looking at the stars you note they have different colors and magnitudes. In order to understand what this features mean, we try to operate as Hertzsprung and Russell did at the beginning of the XX century. Hertzsprung and Russell observed the most luminous stars, plotted their absolute ma ...
... “Ground"). Looking at the stars you note they have different colors and magnitudes. In order to understand what this features mean, we try to operate as Hertzsprung and Russell did at the beginning of the XX century. Hertzsprung and Russell observed the most luminous stars, plotted their absolute ma ...
Good Vibrations and Stellar Pulsations - Physics
... to the Small Magellanic Cloud was 33,000 light years. This was the greatest distance ever determined for an astronomical object. In 1917, Harlow Shapley used Hertzsprung’s calibration of the period-luminosity relation to determine the distance to the globular clusters (some of which contain Cepheids ...
... to the Small Magellanic Cloud was 33,000 light years. This was the greatest distance ever determined for an astronomical object. In 1917, Harlow Shapley used Hertzsprung’s calibration of the period-luminosity relation to determine the distance to the globular clusters (some of which contain Cepheids ...
Star Formation
... • Supernova blast waves near clouds can initiate star formation (happened for our own sun, from SNe produced radioactive daughter products in meteorites) • Collapse raises density, core cannot radiate away heat gravitational collapse heat fast enough, and temp rises, until H fusion begins at 10 mill ...
... • Supernova blast waves near clouds can initiate star formation (happened for our own sun, from SNe produced radioactive daughter products in meteorites) • Collapse raises density, core cannot radiate away heat gravitational collapse heat fast enough, and temp rises, until H fusion begins at 10 mill ...
Determining the Sizes & Distances of Stars Using the H
... Stars are born with a wide variety of mass. The most massive stars are 100 times more massive than the Sun while the least massive ones are only 0.08 times the mass of the Sun. Most stars spend about 90% of their lifetimes shining due to nuclear fusion that goes on in their cores, but after awhile t ...
... Stars are born with a wide variety of mass. The most massive stars are 100 times more massive than the Sun while the least massive ones are only 0.08 times the mass of the Sun. Most stars spend about 90% of their lifetimes shining due to nuclear fusion that goes on in their cores, but after awhile t ...
The Sun and other Stars
... the same time, but independently of each other. H-R Diagram – A graph on which stars are located according to their temperature and luminosity. ...
... the same time, but independently of each other. H-R Diagram – A graph on which stars are located according to their temperature and luminosity. ...
20040907103511001-148699
... Rotation period has increased by factor of 10 during life Viscosity too small to reduce rotation homogeneously throughout the Sun Magnetic Ap stars rotate much slower than „normal“ A stars Did MRI reduce the internal rotation of Sun and Ap stars? ...
... Rotation period has increased by factor of 10 during life Viscosity too small to reduce rotation homogeneously throughout the Sun Magnetic Ap stars rotate much slower than „normal“ A stars Did MRI reduce the internal rotation of Sun and Ap stars? ...
Apparent Magnitude
... off 1000 times more light than Rigel!! SO..If Spica is giving off more light, why would it appear dimmer in the sky here at Earth? ...
... off 1000 times more light than Rigel!! SO..If Spica is giving off more light, why would it appear dimmer in the sky here at Earth? ...
Stellar Remnants
... • About 500 light years away • About 12 miles in diameter • “Tails” from a shock wave as Geminga plows through the interstellar medium ...
... • About 500 light years away • About 12 miles in diameter • “Tails” from a shock wave as Geminga plows through the interstellar medium ...
Announcements
... We can’t see below the horizon (we can’t see through the Earth!). So, we need to have telescopes in different locations, and we have to think about the timing of the Earth’s rotation when planning observations. The Earth is constantly rotating, so a telescope has to constantly move to follow a star ...
... We can’t see below the horizon (we can’t see through the Earth!). So, we need to have telescopes in different locations, and we have to think about the timing of the Earth’s rotation when planning observations. The Earth is constantly rotating, so a telescope has to constantly move to follow a star ...
SOLUTIONS ASTROPHYSICS – OPTION D 2015-17
... The big bang signifies the beginning of time and space. At the big bang the universe was a point and so the big bang happened everywhere in the universe. The question is meaningless within the big bang model since by definition time started with the big bang. It is as meaningless as to ask for a pla ...
... The big bang signifies the beginning of time and space. At the big bang the universe was a point and so the big bang happened everywhere in the universe. The question is meaningless within the big bang model since by definition time started with the big bang. It is as meaningless as to ask for a pla ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.