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Astronomy

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Astronomy 2B03:
Lecture 2:
What’s Out There? * Objects in the universe come in a hierarchy of scales and sizes: * Planets * Stars * Galaxies * The universe as a whole * These scales are so different from one step to the next that they are incredibly hard to comprehend all at once – no “everyday” experience to refer them to * If the Earth were a basketball how big would the moon be? Tennis ball * How many Earths would fit into the Sun? ~ 1 million * How many Jupiter’s would fit inside the Sun? 900 * How many Moons would fit inside the Earth? 50 * If we say the distance from here to Toronto (71 km) represents the distance between the Earth and the Sun, how far are we from Pluto? From Hamilton to Mexico, or from Hamilton to Calgary * If we say the distance from here to Toronto represents the distance between the Earth and the Sun, how far is the Earth from the Moon? From here to the edge of campus (Sterling and Forsyth) * If we say the distance from here to Toronto represents the distance between the Earth and the Sun, how big is the Earth? 3 meters * If we say the distance from here to Toronto represents the distance between the Earth and the Sun, how far is the Sun from the next nearest Star? 1/10th the distance from the Sun to Earth
Lecture 3:
The Earth: * Our starting point and only home * Both land and water * The only planet to have liquid water at its surface * Atmosphere: dense at sea level and then thins upwards * Clouds + weather * Temperature range: from -90 degrees to 60 degrees Celsius
The Moon: * Earth’s only natural satellite * Rocky, ancient surface (powdery) * Airless (no atmosphere) therefore huge temperature range * Geologically dead * No plate tectonics, volcanoes, earthquakes * Huge temperature range *...

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