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Stars and Galaxies
University of Toronto St. George
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Browse the full collection of course materials, past exams, study guides and class notes for AST201H1 - Stars and Galaxies at University of Toronto St. George verified by our …

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Bryan Gaensler, C. Barth Netterfield, Ilana MacDonald

Verified Documents for Bryan Gaensler, C. Barth Netterfield, Ilana MacDonald

Class Notes

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AST201H1 Lecture Notes - Lecture 1: Vera Rubin, Spiral Galaxy, Orbital Speed

One patch of the night sky can have numerous galaxies. If you are looking at things in the sky, it actually means you are looking back in time, as ligh

AST201H1 Lecture 2: Einstein's Theory of Relativity

AST201H1 Lecture 2: LIGHT

How can you tell if a train has moved: you can be looking out the window, seeing if the landscape moves. If there are no windows, you can hear the trai

AST201H1 Lecture Notes - Lecture 2: Special Relativity

Clicker q: q: you fall asleep on a spaceship and wakeup. How can you tell if the spaceship is moving: a: there is no experiment in the universe to tell

AST201H1 Lecture Notes - Lecture 3: Twin Paradox, Length Contraction

AST201H1 Lecture 3: Relativity part 2

Time dilation: when someone is moving relative to you, their clock will seem to be running slower. Not only does time slow down, but also length. Thing

AST201H1 Lecture 4: 2019

If you travelled to the center of our galaxy and back at 99. 9999% of the speed of light, you would age about 8 days, but earth would age 50 000 years.

AST201H1 Lecture 4: AST201 - lecture 4

Objects will move with a constant speed and direction unless acted on by an external. You feel gravity every day, every other force you feel (wind, pus

AST201H1 Lecture Notes - Lecture 5: Gravitational Lens, Strong Gravity, Equivalence Principle

Equivalence principle: no experiment can distinguish a difference between gravity pulling things back to the surface of earth and acceleration. We feel

AST201H1 Lecture Notes - Lecture 6: Cygnus X-1, Event Horizon, Escape Velocity

If you shrank the size of earth while keeping its mass the same means that the escape speed goes up. If you keep crushing the earth smaller and smaller

AST201H1 Lecture Notes - Lecture 7: Cygnus X-1, Photon, Astronomical Object

The black hole in the centre of our galaxy is actually much larger than cygnus x-1. Some elements tend to escape being devoured by black holes, and the

AST201H1 Lecture 8: AST 201 LECTURE 8

A star with a spectrum in the middle (close to where the green light area is) appear white. That is why there is no green stars in the sky. Historicall

AST201H1 Lecture Notes - Lecture 9: Stellar Parallax, Inverse-Square Law

We have information about our sun, mostly because we have sent probes to measure things or observe the sun. However, we have information about distant

AST201H1 Lecture 10: AST 201 - lecture 10

If you know a star"s distance and its brightness, you can figure out the luminosity of a star. You can figure out the temperature by the colour it is a

AST201H1 Lecture 11: AST 201 - lecture 11

In the previous lecture we discussed how to find certain properties of stars without having to go send probes to the stars. We can find the chemical co

AST201H1 Lecture 12: AST 201 - lecture 12

Rule #1 = hotter is brighter if it is the same size. If a star is bluer than it is hotter, if it is redder than it is cooler. In our story, we have com

AST201H1 Lecture Notes - Lecture 15: Main Sequence, Horizontal Branch, Triple-Alpha Process

Topic: lifecycle of a 1 solar mass star. The core expanding and cooling slows things down and stops fusion in the sun"s core from happening faster and

AST201H1 Lecture Notes - Lecture 16: Neon Neon, Nucleon, Solar Mass

Talking about what happens to a star that is above 8 solar masses, and the difference between a low-mass star and high mass star. When all the helium i

AST201H1 Lecture Notes - Lecture 18: Angular Momentum, Degenerate Matter, Tablespoon

Topic: the afterlives of massive stars, neutron stars. The finale stage of a massive star"s life. When there is no more core fusion then gravity starts

AST201H1 Lecture Notes - Lecture 19: Light Pollution

AST201H1 Lecture Notes - Lecture 20: Semi-Major And Semi-Minor Axes, Orbital Period, Vera Rubin

Johannes kepler: had worked from tycho bache"s data and came up with an accurate description of the motion of the planets. #1: planets orbit the sun in

AST201H1 Lecture Notes - Lecture 22: Elliptical Galaxy, Disc Galaxy, Cosmic Distance Ladder

Irregular galaxies are a result of a collision of two galaxies (mergers. ) When its finish its star bursts, it will probably another disk galaxy. But i

AST201H1 Lecture Notes - Lecture 23: Main Sequence, Cosmic Distance Ladder, Edwin Hubble

The stars all have the same age and the stars are all at around the same distance. They are all at around the same distance. Step 1: use radar to deter

AST201H1 Lecture Notes - Lecture 24: Graph Paper, Nucleosynthesis, Neutrino