Maybe We Are Alone in the Universe, After All
... orbits, he said, are wildly eccentric, which would cause destructive chaos among smaller planets rather than shielding them. ''All the Jupiters seen today are bad Jupiters,'' Dr. Ward said. ''Ours is the only good one we know of. And it's got to be good, or you're thrown out into dark space or into ...
... orbits, he said, are wildly eccentric, which would cause destructive chaos among smaller planets rather than shielding them. ''All the Jupiters seen today are bad Jupiters,'' Dr. Ward said. ''Ours is the only good one we know of. And it's got to be good, or you're thrown out into dark space or into ...
1 - WordPress.com
... 10. If astronomers observe a star’s spectrum shifted toward the red end, how is the star moving relative to Earth? ...
... 10. If astronomers observe a star’s spectrum shifted toward the red end, how is the star moving relative to Earth? ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... 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 as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the ma ...
... 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 as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the ma ...
Chemically Peculiar/Magnetic Stars and the a photometry
... 1976: First Da observations published 2001: First chemically peculiar stars detected in the LMC by Da photometry ...
... 1976: First Da observations published 2001: First chemically peculiar stars detected in the LMC by Da photometry ...
Shocking Truth about Massive Stars Lidia Oskinova Chandra’s First Decade of Discovery
... X-rays are too hard to be explained by wind shocks ...
... X-rays are too hard to be explained by wind shocks ...
the star
... structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy nowadays are the dwarf ellipticals. Gas used up long ago ma ...
... structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy nowadays are the dwarf ellipticals. Gas used up long ago ma ...
REVIEW: STAR`S TEST
... What happens to white light as it passes through a prism ? Which color refracts the most and least ? What is thought to be at the center of all galaxies ? _______________________ What is the name of our galaxy ? ____________________________________ Approximately 90% of the visible universe’s mass is ...
... What happens to white light as it passes through a prism ? Which color refracts the most and least ? What is thought to be at the center of all galaxies ? _______________________ What is the name of our galaxy ? ____________________________________ Approximately 90% of the visible universe’s mass is ...
What color are stars?
... Mass transfer in close binary systems can produce unusual double stars • Close binary systems are where only a few stellar diameters, or less, separate the stars • Mass can be dramatically transferred between the stars – detached binary (no mass transfer) – semidetached binary(material can flow acr ...
... Mass transfer in close binary systems can produce unusual double stars • Close binary systems are where only a few stellar diameters, or less, separate the stars • Mass can be dramatically transferred between the stars – detached binary (no mass transfer) – semidetached binary(material can flow acr ...
Answer Key
... 3. Type II supernovae show prominent lines of hydrogen in their spectra, whereas hydrogen lines are absent in spectra of Type Ia supernovae. Why is this? (HINT: Think about the type of star that gives rise to each of the two types of supernova.) A) Massive stars have burned all of their hydrogen int ...
... 3. Type II supernovae show prominent lines of hydrogen in their spectra, whereas hydrogen lines are absent in spectra of Type Ia supernovae. Why is this? (HINT: Think about the type of star that gives rise to each of the two types of supernova.) A) Massive stars have burned all of their hydrogen int ...
Stellar Evolution and the HR Diagram – Study Guide
... 9. The majority of a star’s life is spent on the _main sequence part_____ of the graph. 10. Draw the evolutionary path of our Sun. Start by locating it’s present position on the graph and then indicate where it will be as it ages, and finally what part of the graph it ends in. It would start above R ...
... 9. The majority of a star’s life is spent on the _main sequence part_____ of the graph. 10. Draw the evolutionary path of our Sun. Start by locating it’s present position on the graph and then indicate where it will be as it ages, and finally what part of the graph it ends in. It would start above R ...
Chapter 26 Book Questions
... B. The red shift in the spectra of distant galaxies. C. The fact that the sun is about 20 billion years old. D. The pulling of atoms together into gas clouds by gravity. 34. Recent measurements of the microwave background radiation have led astronomers to estimate that the universe is ______________ ...
... B. The red shift in the spectra of distant galaxies. C. The fact that the sun is about 20 billion years old. D. The pulling of atoms together into gas clouds by gravity. 34. Recent measurements of the microwave background radiation have led astronomers to estimate that the universe is ______________ ...
Stellar evolution
... Result is "onion" structure with many shells of fusionproduced elements. Heaviest element made is iron. ...
... Result is "onion" structure with many shells of fusionproduced elements. Heaviest element made is iron. ...
Chapter 25 Beyond Our Solar System
... dwarf, and finally, a black dwarf. • White dwarfs are the remains of low-mass and medium-mass stars. • Neutron stars, which are smaller and more massive than white dwarfs, are thought to be the remnants of supernova events. • A spinning neutron star that appears to give off pulses of radio waves is ...
... dwarf, and finally, a black dwarf. • White dwarfs are the remains of low-mass and medium-mass stars. • Neutron stars, which are smaller and more massive than white dwarfs, are thought to be the remnants of supernova events. • A spinning neutron star that appears to give off pulses of radio waves is ...
The coolest White Dwarf— older than the age of the universe?
... of 6 solar masses. At this mass, the star could become a WD in 70 Ma. The authors must also be hoping that this object is among the first stars (population III), in which case, why are they applying the theory of normal stars in the galaxy to it (population I and II)? Another interesting idea that f ...
... of 6 solar masses. At this mass, the star could become a WD in 70 Ma. The authors must also be hoping that this object is among the first stars (population III), in which case, why are they applying the theory of normal stars in the galaxy to it (population I and II)? Another interesting idea that f ...
STAR FORMATION (Ch. 19) - University of Texas Astronomy Home
... 6. Central temperature reaches about 10 million K, get ignition of nuclear fusion of H into He. 7. Adjustment to the “zero-age” main sequence. This is when stars can just balance gravity with pressure at all layers, and will spend about 90% of their lives in this stage. (See Fig.19.6) Different stel ...
... 6. Central temperature reaches about 10 million K, get ignition of nuclear fusion of H into He. 7. Adjustment to the “zero-age” main sequence. This is when stars can just balance gravity with pressure at all layers, and will spend about 90% of their lives in this stage. (See Fig.19.6) Different stel ...
Evolution of Stars and Galaxies
... the sun the supernova will contract until so tight only neutrons can exist in the core ...
... the sun the supernova will contract until so tight only neutrons can exist in the core ...
Lecture 12
... We can determine a star’s luminosity if we can measure its distance and apparent brightness: Luminosity = 4π (distance)2 (Brightness) ...
... We can determine a star’s luminosity if we can measure its distance and apparent brightness: Luminosity = 4π (distance)2 (Brightness) ...
Lecture 9
... • Absolute magnitude describes stellar luminosities – Its what the stars apparent magnitude would be if it were 10 parsecs away ...
... • Absolute magnitude describes stellar luminosities – Its what the stars apparent magnitude would be if it were 10 parsecs away ...
REVIEW: STAR`S TEST
... What is the speed of light ? 186,000 MILES/SECOND What is the EMS and what are at its extremes ? RADIO WAVES ...
... What is the speed of light ? 186,000 MILES/SECOND What is the EMS and what are at its extremes ? RADIO WAVES ...
RMH_Stellar_Evolution_Ast2001_09_29_09
... He -> C,O , C,O ->heavier elements up to Fe, as a red supergiant or successive transits across HR diagram ...
... He -> C,O , C,O ->heavier elements up to Fe, as a red supergiant or successive transits across HR diagram ...
star brightness
... far y bright star ver t star For example, the neares ri, tau Cen to our Sun is Alpha tant. dis ...
... far y bright star ver t star For example, the neares ri, tau Cen to our Sun is Alpha tant. dis ...
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.