Announcements Evolution of High-Mass Stars: Red Supergiants
... • Parallax only works for nearby stars (within about 1000 light years) • For more distant stars, we use Standard Candles Car Headlights are standard candles: We use them to determine the car’s distance ...
... • Parallax only works for nearby stars (within about 1000 light years) • For more distant stars, we use Standard Candles Car Headlights are standard candles: We use them to determine the car’s distance ...
Introduction to Astronomy
... Cecilia Payne at Harvard, 1924 In the sun, only one H atom in a million is in level 2, ready to absorb visible light! ...
... Cecilia Payne at Harvard, 1924 In the sun, only one H atom in a million is in level 2, ready to absorb visible light! ...
April 1st
... Core Uses up hydrogen • When the core uses up its hydrogen • Gravity causes the core to shrink • The star leaves the main sequence ...
... Core Uses up hydrogen • When the core uses up its hydrogen • Gravity causes the core to shrink • The star leaves the main sequence ...
What The Star of Bethlehem Was Not
... the magi saw a bright meteor, or possibly two bright meteors – one to tell them when Jesus was born, the other to tell them that they had arrived at their destination. An alternative which he has proposed is a "Cyrillid" meteor shower. The Cyrillids were a meteor shower seen on just one occasion, ea ...
... the magi saw a bright meteor, or possibly two bright meteors – one to tell them when Jesus was born, the other to tell them that they had arrived at their destination. An alternative which he has proposed is a "Cyrillid" meteor shower. The Cyrillids were a meteor shower seen on just one occasion, ea ...
S1E4 Extreme Stars
... As hydrogen in the core is being used up, it starts to contract, raising temperature in the surrounding. Eventually, hydrogen will burn only in a shell. There is less gravity from above to balance this pressure. The Sun will then swell to enormous size and luminosity, and its surface temperature wil ...
... As hydrogen in the core is being used up, it starts to contract, raising temperature in the surrounding. Eventually, hydrogen will burn only in a shell. There is less gravity from above to balance this pressure. The Sun will then swell to enormous size and luminosity, and its surface temperature wil ...
Goals of the day Clickers Order of Magnitude Astronomy
... • The solar system is light-hours in size • The Local group is millions of light-years in size ...
... • The solar system is light-hours in size • The Local group is millions of light-years in size ...
proper motion
... parallax shifts with respect to the distant background of stars. Tycho Brahe improved positional measures from +/- 10 arc minutes to as good as +/- 1 arc minute, but he could measure no parallaxes. This implied either that the stars were more than 3000 Astronomical Units away, or that the Earth was ...
... parallax shifts with respect to the distant background of stars. Tycho Brahe improved positional measures from +/- 10 arc minutes to as good as +/- 1 arc minute, but he could measure no parallaxes. This implied either that the stars were more than 3000 Astronomical Units away, or that the Earth was ...
Script - ESA/Hubble
... Next, the outer layers are puffed out, forming a dense cloud of gas and dust that totally obscures the visible light from the star. This stage, called a pre-planetary, or protoplanetary nebula, is tough to observe as it’s so faint — only dim infrared emissions from the dust cloud and reflected starl ...
... Next, the outer layers are puffed out, forming a dense cloud of gas and dust that totally obscures the visible light from the star. This stage, called a pre-planetary, or protoplanetary nebula, is tough to observe as it’s so faint — only dim infrared emissions from the dust cloud and reflected starl ...
Sammy Nagel · Annie Jump Cannon
... She discovered a system for describing how hot stars are. She used a mnemonic device to remember the letters. the letters were O B A F G K M. The mnemonic was "Oh, be a fine girlkiss me" The O is the hottest star. The M is the coolest star. G is the same as the sun. The hottest two stars are O and B ...
... She discovered a system for describing how hot stars are. She used a mnemonic device to remember the letters. the letters were O B A F G K M. The mnemonic was "Oh, be a fine girlkiss me" The O is the hottest star. The M is the coolest star. G is the same as the sun. The hottest two stars are O and B ...
Essay - CLC Charter School
... are crushed together, temperatures reach billions of degrees Celsius, and then a series of nuclear reactions is unleashed. The supernova produces a giant shock wave that throws matter into space at 9,000 to 25,000 miles per second. Type Ia, Ib and Ic Supernovae There are several classes of supernova ...
... are crushed together, temperatures reach billions of degrees Celsius, and then a series of nuclear reactions is unleashed. The supernova produces a giant shock wave that throws matter into space at 9,000 to 25,000 miles per second. Type Ia, Ib and Ic Supernovae There are several classes of supernova ...
Earth_Universe04
... • Strong magnetic field • First one discovered in early 1970s • Pulsar (pulsating radio source) • Found in the Crab nebula (remnant of an A.D. 1054 supernova) ...
... • Strong magnetic field • First one discovered in early 1970s • Pulsar (pulsating radio source) • Found in the Crab nebula (remnant of an A.D. 1054 supernova) ...
The Solar Neighborhood
... Since brighter stars are designated with a smaller number for apparent magnitude, magnitudes are plotted in reverse order to put the brighter stars at the top. Investigating Stellar Evolution - For each cluster, identify the main sequence, and sketch in a line that follows the main sequence from its ...
... Since brighter stars are designated with a smaller number for apparent magnitude, magnitudes are plotted in reverse order to put the brighter stars at the top. Investigating Stellar Evolution - For each cluster, identify the main sequence, and sketch in a line that follows the main sequence from its ...
The Young Astronomers Newsletter Volume 22 Number 3 February
... 2009 FD had been ranked among the top five objects in a list of the most dangerous objects, but new observations have now shown that it is far less likely to hit the Earth than had been feared. ...
... 2009 FD had been ranked among the top five objects in a list of the most dangerous objects, but new observations have now shown that it is far less likely to hit the Earth than had been feared. ...
Measuring large distances
... So based on the color of a star, and how bright it is, it’s possible to make a guess about how far away the star is. ...
... So based on the color of a star, and how bright it is, it’s possible to make a guess about how far away the star is. ...
Chpt12a
... towards the red giant branch. At the end of this phase the star’s luminosity is hundreds of times greater and its radius is 100 solar radii. ...
... towards the red giant branch. At the end of this phase the star’s luminosity is hundreds of times greater and its radius is 100 solar radii. ...
Lecture 2+3 - University of Texas Astronomy Home Page
... - its central and outer layers of gas containing H, He, C, and N, O, Sulfur, Silicon, Iron are blown out by a supernova (SN) explosion, and form a SN remnant, made of hot glowing gas. The remnant enriches surrounding gas with these elements and the gas later collapses to form a new generation of sta ...
... - its central and outer layers of gas containing H, He, C, and N, O, Sulfur, Silicon, Iron are blown out by a supernova (SN) explosion, and form a SN remnant, made of hot glowing gas. The remnant enriches surrounding gas with these elements and the gas later collapses to form a new generation of sta ...
Grade 9 Applied Science
... 8. Increasing in size; a period during which the visible surface of the Moon increases ...
... 8. Increasing in size; a period during which the visible surface of the Moon increases ...
PPT - UBC
... (e) Masses and radii of stars from binary systems, Kepler's Laws, Mass-radius relationship. Pre-reading pages 23 - 33, 48 - 49, 180 - 198. (f) Hertzsprung-Russell Diagram, dwarf, giant and supergiant stars, white dwarfs, first clues to stellar evolution. Pre-reading Chapter 8. ...
... (e) Masses and radii of stars from binary systems, Kepler's Laws, Mass-radius relationship. Pre-reading pages 23 - 33, 48 - 49, 180 - 198. (f) Hertzsprung-Russell Diagram, dwarf, giant and supergiant stars, white dwarfs, first clues to stellar evolution. Pre-reading Chapter 8. ...
Lecture02-ASTA01 - University of Toronto
... • Although constellations and asterisms are named as if they were real groupings, most are made up of stars that are not physically associated with one another. • Some stars may be many times farther away than others in the same constellation and moving through space in different directions. ...
... • Although constellations and asterisms are named as if they were real groupings, most are made up of stars that are not physically associated with one another. • Some stars may be many times farther away than others in the same constellation and moving through space in different directions. ...
Stellar Evolution Chapter 12
... recent maximum can be used to predict the time of a future maximum. Suppose that you calculate the time of future maximum brightness and then make measurements to observe this maximum. After the correction for Earth's orbital position has been made, you find that the maximum occurred a few minutes l ...
... recent maximum can be used to predict the time of a future maximum. Suppose that you calculate the time of future maximum brightness and then make measurements to observe this maximum. After the correction for Earth's orbital position has been made, you find that the maximum occurred a few minutes l ...
stars_2nd_edit
... Red Dwarf stars can range in size from a hundred times smaller than the sun, to only a couple of times smaller. Because of their small size these stars burn their fuel very slowly, which allows them to live a very long time. Some red dwarf stars will live trillions of years before they run out of fu ...
... Red Dwarf stars can range in size from a hundred times smaller than the sun, to only a couple of times smaller. Because of their small size these stars burn their fuel very slowly, which allows them to live a very long time. Some red dwarf stars will live trillions of years before they run out of fu ...
AST101_lect_12
... • Most stars are on the main sequence. – Stars spend most of their life on the main sequence – Most stars are faint and red • Giants and supergiants are visible from great distances. – Giants and supergiants are rare. ...
... • Most stars are on the main sequence. – Stars spend most of their life on the main sequence – Most stars are faint and red • Giants and supergiants are visible from great distances. – Giants and supergiants are rare. ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.