Last time… we finished Ch. 1

[Pages:51]Last time... we finished Ch. 1

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Last time... we finished Ch. 1

The expansion of the Universe and Hubble

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Last time... we began Ch. 2

The appearance of the Milky Way on our sky

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Does it make sense?

I use tools like google etc. a lot, for example to convert units (fahrenheit to celsius, dollars to euros, etc, etc) and for factual knowledge such as the circumference of the earth.

And this is excellent. However, remember to always be critical. Does it make sense?? Need to be careful

-- This is similar to problem solving we do in class; does your answer make sense?

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Admin

HW 1 due tomorrow ** 3.00 PM ** Note: This time there will be a penalty for late submissions. Should take you something like 1 ? 2 hours to do complete HW 1. 2nd Lab tonight/tomorrow ? `Stellarium' Course Calendar:

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Extra due to questions... (keep on asking!!)

Computer Simulation of Galaxy Collision:

Credit MPA Munich, V. Springel



Time scale billion of years, stars not affected.

Why are we safe from colliding with nearby stars?

In our neighborhood, the distance between stars (several light years ~ 10^12 km) is much, much larger than size of sun

(~7 x 10^5 km in radius).

? Since it's a bit outside the course, I'll calculate the time we have to wait to get such a collision between our sun and another star in the break...

Eager to learn more? Here's a good link:



Ch 2 -- Some things we'll discuss

"Everyday astronomy" 1. Patterns in the Sky 2. The Cause of Seasons 3. The Moon, Our Constant Companion 4. The Ancient Mystery of the Planets

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We measure the sky using angles.

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