ASTA01H3 Lecture Notes - Lecture 1: Ursa Major, Light Pollution, Calender
Document Summary
Week 1: mass of the sun (cid:1005)9(cid:1004),(cid:1004)(cid:1004)(cid:1004)(cid:1004)(cid:1004)(cid:1004)(cid:1004) . (cid:894)(cid:1006)9(cid:895, the orbit around the sun for earth is a ellipse, kilo- 10^3, mega- million- 10^6, giga- billion- 10^9, tera- trillion- 10^12, milli- 10^-3, micro- 10^-6, nano- 10^-9, angstrom- 10^-10. Is a measure internal energy of a molecule. If 0 kelvin than no energy left: there are no negative kelvin, cosmic micro wave background (it is a radiation coming from everywhere) (lowest temperature. 2. 7 degree kelvin: t kelvin = t celsius +273. Speed of light = 300,000 km/s: 1 light year is the distance light travels in course of a year 10 trillion in 1 year. A time machine: delay in time by the reflection of time, example 4. 4 years ( proxmi centuri) light away from earth is probably died but we are looking at 4 years old star. Ligth year make u think the distance and how past.
