Sample Math problems
... 1) From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude? a) The star is getting colder b) T ...
... 1) From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude? a) The star is getting colder b) T ...
Multiple choice test questions 2, Winter Semester
... A) The age of the universe is about 600 million times H0. B) The inverse of H0 is the approximate age of the universe. C) They do not. The age of the universe is unknowable. 20) Does Hubble's law work well for galaxies in the Local Group? Why or why not? A) No, because galaxies in the Local Group ar ...
... A) The age of the universe is about 600 million times H0. B) The inverse of H0 is the approximate age of the universe. C) They do not. The age of the universe is unknowable. 20) Does Hubble's law work well for galaxies in the Local Group? Why or why not? A) No, because galaxies in the Local Group ar ...
PPT file
... In star formation regions was found periodicity of masers variations (few years periods). This sources have usually three spectral components and probably correspondent to proto planet disks formed around proto star. It was found that variability of masers in stars envelopes strong correlate with IR ...
... In star formation regions was found periodicity of masers variations (few years periods). This sources have usually three spectral components and probably correspondent to proto planet disks formed around proto star. It was found that variability of masers in stars envelopes strong correlate with IR ...
ASTR 1120H – Spring Semester 2010 Exam 2 – Answers The
... parameter that cannot be obtained from single stars). The mass can be calculated, using Newton's version of Kepler's 3rd law, from the binary system's period and orbital separation. 9. What are H II regions? Near what kinds of stars are they found? Why do only these stars give rise to H II regions? ...
... parameter that cannot be obtained from single stars). The mass can be calculated, using Newton's version of Kepler's 3rd law, from the binary system's period and orbital separation. 9. What are H II regions? Near what kinds of stars are they found? Why do only these stars give rise to H II regions? ...
Stellar Evolution
... That appear to us as a Pulsar, a source of a rhythmic radio signal first thought to be intelligent aliens! ...
... That appear to us as a Pulsar, a source of a rhythmic radio signal first thought to be intelligent aliens! ...
Reminder: Assignments are due back to teachers within 2 school days.
... The discoveries of the white dwarf, the neutron star, and the black hole, coming well after the discovery of the red giant are among eh most exciting developments in decades because they may be well present physicists with their greatest challenge since thefailure of classical mechanics. In the lif ...
... The discoveries of the white dwarf, the neutron star, and the black hole, coming well after the discovery of the red giant are among eh most exciting developments in decades because they may be well present physicists with their greatest challenge since thefailure of classical mechanics. In the lif ...
Binary Star Systems
... “Half of all stars in the sky are members of binary systems.” Binary star systems consist of two stars that orbit around a point called the center of mass. ...
... “Half of all stars in the sky are members of binary systems.” Binary star systems consist of two stars that orbit around a point called the center of mass. ...
슬라이드 1
... A Grouping of 4 major objects at z = 5.30 COSMOS AzTEC-3: extreme starburst galaxy (Riechers et al. 2010, ApJ, 720, L131) - molecular gas >5.3x1010M⊙, dynamical mass (+ DM) >1.4x1011M⊙ Overdensity near AzTEC-3: - L60-120um ~ (1.7±0.8)x1013L⊙ → SFR > 1500M⊙ /yr : 100 times the rate of an average L* ...
... A Grouping of 4 major objects at z = 5.30 COSMOS AzTEC-3: extreme starburst galaxy (Riechers et al. 2010, ApJ, 720, L131) - molecular gas >5.3x1010M⊙, dynamical mass (+ DM) >1.4x1011M⊙ Overdensity near AzTEC-3: - L60-120um ~ (1.7±0.8)x1013L⊙ → SFR > 1500M⊙ /yr : 100 times the rate of an average L* ...
COSMOLOGY 1 An Introduction to the Universe
... striking "planetary nebula", much like the nebulae seen around the remnants of other stars. The carbon core will eventually cool and become a white dwarf, the dense dim remnant of a once bright star. ...
... striking "planetary nebula", much like the nebulae seen around the remnants of other stars. The carbon core will eventually cool and become a white dwarf, the dense dim remnant of a once bright star. ...
My Presentation
... electromagnetic radiation (electric and magnetic energy). This energy causes the star to erupt into a supernova. Most supernovae reach maximum brightness a few days after they occur and shine intensely for several weeks. Some fade within months. Others fade over a period of years. Supernovae also di ...
... electromagnetic radiation (electric and magnetic energy). This energy causes the star to erupt into a supernova. Most supernovae reach maximum brightness a few days after they occur and shine intensely for several weeks. Some fade within months. Others fade over a period of years. Supernovae also di ...
E5 stellar processes and stellar evolution (HL only)
... • Neutron stars with masses substantially more than the Oppenheimer-Volkoff limit continue to collapse as the neutron pressure is insufficient. They become Black holes • At the centre of the black hole is a singularity • The boundary around the singularity where even light does not have sufficient e ...
... • Neutron stars with masses substantially more than the Oppenheimer-Volkoff limit continue to collapse as the neutron pressure is insufficient. They become Black holes • At the centre of the black hole is a singularity • The boundary around the singularity where even light does not have sufficient e ...
The Life Cycles of Stars
... supernova. Neutron stars spin rapidly giving off radio waves. If the radio waves are emitted in pulses (due to the star’s spin), these neutron stars are called pulsars. The core of a massive star that has 8 or more times the mass of our Sun remains massive after the supernova. No nuclear fusion is t ...
... supernova. Neutron stars spin rapidly giving off radio waves. If the radio waves are emitted in pulses (due to the star’s spin), these neutron stars are called pulsars. The core of a massive star that has 8 or more times the mass of our Sun remains massive after the supernova. No nuclear fusion is t ...
The Sun and Other Stars - Tuslaw Local School District
... * 5 x’s the mass of the sun, 30 km in diameter * the gravity is so strong nothing can escape including light! ...
... * 5 x’s the mass of the sun, 30 km in diameter * the gravity is so strong nothing can escape including light! ...
November 2013 - Pomona Valley Amateur Astronomers
... Novas and Supernovas. Tycho Brahe saw a supernova that was brighter than Venus in 1572. Thirty-two years later Johannes Kepler observed another supernova. While actually observing a nova or supernova occurring in our galaxy is very rare, we can observe the aftermath remnants of an exploding star. M1 ...
... Novas and Supernovas. Tycho Brahe saw a supernova that was brighter than Venus in 1572. Thirty-two years later Johannes Kepler observed another supernova. While actually observing a nova or supernova occurring in our galaxy is very rare, we can observe the aftermath remnants of an exploding star. M1 ...
5Stars_Part_Two
... in England was studying the scintillation of radio sources due to the solar wind. 2. A graduate student named Jocelyn Bell Burnell discovered a strong night time source of “twinkling”. 3. Its location was fixed with respect to the stars. From Jay Pasachoff’s “Contemporary Astronomy” ...
... in England was studying the scintillation of radio sources due to the solar wind. 2. A graduate student named Jocelyn Bell Burnell discovered a strong night time source of “twinkling”. 3. Its location was fixed with respect to the stars. From Jay Pasachoff’s “Contemporary Astronomy” ...
FLASHBACKS - Clinton County High School
... 3. We use the olfactory system in our body to do what? Smell 4. Which Ohio-born inventor held over 1,000 patents, including one for the invention of the motion-picture projector? Thomas Edison ...
... 3. We use the olfactory system in our body to do what? Smell 4. Which Ohio-born inventor held over 1,000 patents, including one for the invention of the motion-picture projector? Thomas Edison ...
Star Properties and Stellar Evolution
... 1. Pulsating stars – expand and contract 2. Cepheid Variables – used to find distances to galaxies that contain them 3. Eclipsing Binaries – 2 stars revolve around each other ...
... 1. Pulsating stars – expand and contract 2. Cepheid Variables – used to find distances to galaxies that contain them 3. Eclipsing Binaries – 2 stars revolve around each other ...
Chapter 15 Stars, Galaxies
... become black holes. Stars that are less massive but still high-mass stars become neutron stars. f. They all start out as a part of nebulas that contract to form protostars. g. Low-mass and medium-mass stars turn into red giants as they use up their fuel. They later form planetary nebulas and white d ...
... become black holes. Stars that are less massive but still high-mass stars become neutron stars. f. They all start out as a part of nebulas that contract to form protostars. g. Low-mass and medium-mass stars turn into red giants as they use up their fuel. They later form planetary nebulas and white d ...
Stars
... Kepler’s 3rd law) imply a mass of 2.6106 solar masses inside a volume 0.03 light years in diameter. It is impossible to pack stars together that tightly – they would collide, destroying each other very quickly. It is likely that the object at the center of our galaxy is a super massive black hole. ...
... Kepler’s 3rd law) imply a mass of 2.6106 solar masses inside a volume 0.03 light years in diameter. It is impossible to pack stars together that tightly – they would collide, destroying each other very quickly. It is likely that the object at the center of our galaxy is a super massive black hole. ...
Review for Midterm 1
... How are emission, absorption, and continuous spectra created? What can the spectrum of a star tell us about the star? What else can we learn from spectra? What does the energy of a photon depend on? What is the sun mostly made of; how do we know? What are the different types of light? 3. Births of s ...
... How are emission, absorption, and continuous spectra created? What can the spectrum of a star tell us about the star? What else can we learn from spectra? What does the energy of a photon depend on? What is the sun mostly made of; how do we know? What are the different types of light? 3. Births of s ...
An Assessment: Think Pair Share
... The cosmic background radiation is visible in all directions at a temperature of 3 degrees absolute zero. Almost every galaxy has a red-shift, with more distant galaxies having the highest red-shift. The closest galaxies are all blue-shifted, showing that our universe is slowing down. ...
... The cosmic background radiation is visible in all directions at a temperature of 3 degrees absolute zero. Almost every galaxy has a red-shift, with more distant galaxies having the highest red-shift. The closest galaxies are all blue-shifted, showing that our universe is slowing down. ...
When will a neutron star collapse to a black hole?
... billions of times that of the densest element on Earth. An important property of neutron stars, distinguishing them from normal stars, is that their mass cannot grow without bound. Indeed, if a nonrotating star increases its mass, also its density will increase. Normally this will lead to a new equi ...
... billions of times that of the densest element on Earth. An important property of neutron stars, distinguishing them from normal stars, is that their mass cannot grow without bound. Indeed, if a nonrotating star increases its mass, also its density will increase. Normally this will lead to a new equi ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.