Study Guides for AST201H1 at University of Toronto St. George (UTSG)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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