astronomy timeline
... Albert Einstein explains the photoelectric efect. Einstein explained that the emission of electrons only by light at short wavelengths occurs because light consistes of bundles of energy called photons. p. 97, F 3.2 ...
... Albert Einstein explains the photoelectric efect. Einstein explained that the emission of electrons only by light at short wavelengths occurs because light consistes of bundles of energy called photons. p. 97, F 3.2 ...
X-ray Sources in Nearby Galaxies Q. Daniel Wang University of Massachusetts
... • Evolution of HMXBs and LMXBs (talk by Andreas Zezas). • Discrete source populations such as SNe, SNRs, YSOs. • Effects of AGN energy injection, accretion from the IGM, clustering environment on diffuse hot plasma. • Diffuse hard X-rays: e.g., reflection, inverse Compton scattering, & synchrotr ...
... • Evolution of HMXBs and LMXBs (talk by Andreas Zezas). • Discrete source populations such as SNe, SNRs, YSOs. • Effects of AGN energy injection, accretion from the IGM, clustering environment on diffuse hot plasma. • Diffuse hard X-rays: e.g., reflection, inverse Compton scattering, & synchrotr ...
Cosmic Survey PowerPoint
... galaxies are among the most ancient and distant objects we can see in the sky. The light from them has taken about 10 billion years to reach us. So they were born long before the Sun. On the other hand, the Hubble deep field galaxies are young! Because light takes time to travel, telescope images of ...
... galaxies are among the most ancient and distant objects we can see in the sky. The light from them has taken about 10 billion years to reach us. So they were born long before the Sun. On the other hand, the Hubble deep field galaxies are young! Because light takes time to travel, telescope images of ...
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 ...
Astronomy Teaching that Focuses on Learning Subtitled
... The Big Bang organized pre-existing matter All bright stars must be very hot The solar system contains millions of stars A comet is a tiny galaxy ...
... The Big Bang organized pre-existing matter All bright stars must be very hot The solar system contains millions of stars A comet is a tiny galaxy ...
astronomy webquest…… explore the universe
... Stars and planets are made from gases in a __________________. The Milky Way Galaxy is approximately _______________ light years across. How much longer will our Sun last? _________________________ Lifetimes of stars range from ___________ to ____________ years. Our star orbits the centre of our gal ...
... Stars and planets are made from gases in a __________________. The Milky Way Galaxy is approximately _______________ light years across. How much longer will our Sun last? _________________________ Lifetimes of stars range from ___________ to ____________ years. Our star orbits the centre of our gal ...
The Chemical Composition of Stars in Open Clusters
... the solar atmosphere agree so weil with the relative abundances found in meteorites indicates that solar-type stars, i. e. late Fand early G main-sequence stars, have indeed the same atmospheric composition as the material out of which they were formed. Also the composition of most nearby B main-seq ...
... the solar atmosphere agree so weil with the relative abundances found in meteorites indicates that solar-type stars, i. e. late Fand early G main-sequence stars, have indeed the same atmospheric composition as the material out of which they were formed. Also the composition of most nearby B main-seq ...
April 2013
... hydrogen and helium, contains more 'ices' such as water, ammonia and methane, along with traces of hydrocarbons. It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of −224 °C. It has a complex, layered cloud structure, with water thought to make up the lowest clou ...
... hydrogen and helium, contains more 'ices' such as water, ammonia and methane, along with traces of hydrocarbons. It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of −224 °C. It has a complex, layered cloud structure, with water thought to make up the lowest clou ...
1.3 Lifecycle of stars
... This pressure is almost independent of temperature— when the helium starts fusing, the pressure cannot ...
... This pressure is almost independent of temperature— when the helium starts fusing, the pressure cannot ...
Nov13Guide - East-View
... High in the sky looking southwards, the square of Pegasus is still the group of stars which catches the eye, but the square is joined to the east by the ancient constellation of Andromeda. Andromeda was the mythological daughter of Queen Cassiopeia and King Cepheus who was rescued from Cetus, the se ...
... High in the sky looking southwards, the square of Pegasus is still the group of stars which catches the eye, but the square is joined to the east by the ancient constellation of Andromeda. Andromeda was the mythological daughter of Queen Cassiopeia and King Cepheus who was rescued from Cetus, the se ...
Whiteq
... become cool enough for ionized atoms to recombine, the star's outer layers become unstable. The instability occurs because the temperature for the reaction is borderline, and the recombination releases energy. So, the outer layers contract, and expand, becoming warmer and cooler, and eventually the ...
... become cool enough for ionized atoms to recombine, the star's outer layers become unstable. The instability occurs because the temperature for the reaction is borderline, and the recombination releases energy. So, the outer layers contract, and expand, becoming warmer and cooler, and eventually the ...
MULTIPLE CHOICE QUESTIONS (50 pts
... D. both of them have very small masses compared to the Earth. E. the wind speeds are very high and produce a blue shift. 4. The single most important factor influencing a star’s evolution is A. the strength of its magnetic field. B. its rotation rate. C. its surface temperature. D. its mass. E. its ...
... D. both of them have very small masses compared to the Earth. E. the wind speeds are very high and produce a blue shift. 4. The single most important factor influencing a star’s evolution is A. the strength of its magnetic field. B. its rotation rate. C. its surface temperature. D. its mass. E. its ...
lec-life-main-sequen..
... electrostatic charge (positive, in the case of nuclei) and therefore repel each other very strongly. So a cloud of gas has to be very compressed (or collapse a great deal under its own weight) before the high pressure and temperature can overcome this repulsion, and fusion can begin. ...
... electrostatic charge (positive, in the case of nuclei) and therefore repel each other very strongly. So a cloud of gas has to be very compressed (or collapse a great deal under its own weight) before the high pressure and temperature can overcome this repulsion, and fusion can begin. ...
The Sun*s Energy
... Brown Dwarfs -Stars in formation will begin to have nuclear reactions as long as they have enough gravitational energy to generate fast-moving, high-pressure cores where fusion can occur -If a “pre-star” has a mass less than 8% of the Sun this type of fusion cannot begin, and the “star” will grow di ...
... Brown Dwarfs -Stars in formation will begin to have nuclear reactions as long as they have enough gravitational energy to generate fast-moving, high-pressure cores where fusion can occur -If a “pre-star” has a mass less than 8% of the Sun this type of fusion cannot begin, and the “star” will grow di ...
Chemical Universe. - University of Texas Astronomy
... in the universe’s chemical factories: the stars. Except for those created in the laboratory, every element heavier than lithium was created by a star. That includes every atom of oxygen that we breathe, every atom of calcium in our bones and iron in our blood, every atom of gold in our jewelry. So w ...
... in the universe’s chemical factories: the stars. Except for those created in the laboratory, every element heavier than lithium was created by a star. That includes every atom of oxygen that we breathe, every atom of calcium in our bones and iron in our blood, every atom of gold in our jewelry. So w ...
Physics 1025: Lecture 17 Sun (cont.), Stellar Distances, Parallax
... astronomical questions is the distance to the stars; every class from now on will introduce at least one means for this determination – astronomers are very clever in finding indirect means, since there is only one direct method and the stars are very far away. Parallax is the only direct way to mea ...
... astronomical questions is the distance to the stars; every class from now on will introduce at least one means for this determination – astronomers are very clever in finding indirect means, since there is only one direct method and the stars are very far away. Parallax is the only direct way to mea ...
ASTR 1120-001 Final Examination Phil Armitage, Bruce Ferguson
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
... 67. Suppose that we lived in a Big Crunch Universe at a time when it was contracting, rather than expanding. If you measured the velocities of many galaxies, you would find that typically: (a) Galaxies (except very nearby ones) were moving away from you, with the most distant ones moving away the sl ...
Star Basics
... helium. At these temperatures most of the hydrogen is ionized, so the hydrogen lines are weak. Both HeI and HeII (singly ionized helium) are seen in the higher temperature examples. The radiation from O5 stars is so intense that it can ionize hydrogen over a volume of space 1000 light years across. ...
... helium. At these temperatures most of the hydrogen is ionized, so the hydrogen lines are weak. Both HeI and HeII (singly ionized helium) are seen in the higher temperature examples. The radiation from O5 stars is so intense that it can ionize hydrogen over a volume of space 1000 light years across. ...
ASTR 101 Scale of the Universe: an Overview
... What is the shape of the milky way? Where is the Sun’s location in it? What is the estimated number of stars in the Milky way, what is its diameter? Can we see all of the Milky way galaxy from Earth? What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe ...
... What is the shape of the milky way? Where is the Sun’s location in it? What is the estimated number of stars in the Milky way, what is its diameter? Can we see all of the Milky way galaxy from Earth? What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.