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Study Guides for AS102 at Wilfrid Laurier University

Astronomy II: Journey Through the Cosmos

AS102 Study Guide - Final Guide: Protostar
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When we look away from Earth, especially at night, we see an inky black sky dotted with stars and we could easily come to the conclusion that most of outer space is filled with nothing. However, that is a misconception. E...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Main Sequence
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So, in determining a star's spectral type (indirectly, temperature) and luminosity we are really learning more about its mass than anything else. Clearly, they are all tied together but mass is the most important factor. ...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Sirius, Red Dwarf, Binary Star
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We see, once again, that our Sun is a pretty average (or mid-range, from a mass perspective) star with a pretty average lifetime. Luminous (high mass) stars are rare because, as we will learn, they have a relatively short...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Vy Canis Majoris, 4Minute
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The current explanation of GRBs is that many observed GRBs are believed to be a "narrow beam of intense radiation released during a supernova event, as a rapidly rotating, high mass star collapses to form a black hole. Su...

Astronomy
AS102
basil
AS102 Study Guide - Midterm Guide: Radio Wave
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Up to that point in time nothing was known to pulsate so regularly so precisely that it kept better time than most watches. The mystery was soon resolved as it was determined that the source of the radio wave pulses was ...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Main Sequence, Subgiant, Red Giant
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The Initial Dying Stage As the H-He fusion furnace begins to flicker out, gravity begins to dominate the star's life and the inward collapse that initiated the star's birth some millions or billions of years ago becomes ...

Astronomy
AS102
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AS102 Study Guide - Final Guide: White Dwarf, Carbon-Burning Process, Planetary Nebula
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This time, helium fusion begins around the carbon core. Meanwhile, the hydrogen furnace in the outer shell is still proceeding and the two shell layers (there was only one before) now begin to swell to an even greater siz...

Astronomy
AS102
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AS102 Study Guide - Final Guide: White Dwarf, Radio Wave
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The picture shown here shows a neutron star (the arrow points it out) in visible light. The mass of the star which produces a neutron star is great enough to overcome the electron degeneracy force which halted the collaps...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Gravitational Redshift
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The resulting point mass is called a black hole because if we shine light on it, the light will be captured by the black hole and will not be reflected. The General Theory of Relativity predicts the...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Cygnus X-1, Accretion Disk, Hubble Space Telescope
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The masses of black holes range from 3 times the mass of the Sun (or 3 M Sun to 21 billion times the mass of the Sun (21 x 10 M 9 ) Sun quite a wide range. It is believed th...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Nucleon
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The Endpoint Why is iron production the end of the line for the fusion process? Iron is element #56 there are another 36 elements to go before we get to Uranium 92. Recall that the fusion of lighter elements (such as w...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Event Horizon, Karl Schwarzschild
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The Schwarzschild Radius The closest anything, including light, can get to a black hole without becoming part of the mass making up the black hole, is called the event horizon, so named because no information can ever re...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Crab Nebula, Supernova Remnant
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Supernova Observations You should read the section on the observations of supernovae in your textbook. It describes the anticipated frequency of supernovae observations and something about those that have been observed. ...

Astronomy
AS102
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AS102 Study Guide - Final Guide: Main Sequence
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Stage 4 collapse continues until the temperature stabilizes at well over 10 million K and thermal pressure halts the gravitational collapse a star is born!

Astronomy
AS102
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AS102 Study Guide - Quiz Guide: Red Giant, Triple-Alpha Process
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The collapse of the core continues until the temperature has reached 100 million K and now helium fusion can begin. By this time, the temperature of the hydrogen shell has reached 15 million K and it, too, can begin fusin...

Astronomy
AS102
basil

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