AST201H1 Lecture Notes - Interstellar Cloud, Ballpoint Pen, Solar System

44 views2 pages
bhogalsim and 39543 others unlocked
AST201H1 Full Course Notes
24
AST201H1 Full Course Notes
Verified Note
24 documents

Document Summary

Sun will expand, engulf the earth and destroy everything on the planet (in about 4. 5 million yrs. ) Stars - hydrogen + helium with nuclear fusion at the centre; have own source of energy (unlike a planet: different telescopes allows different ways to see universe. Planets - orbit a star; can be rocky, icy or gassy in composition; don"t produce much energy. In 2006 the international astronomical union accepted a new definition of the term planet": 1. Planets orbit a star (not another planet: 2, 3. Pluto is not a planet because its orbit is full of other stuff (mainly comets) If sun is grapefruit, earth is tip of ballpoint pen. Solar system is huge and vast majority is empty". 1au = astronomical unity, the average distance between earth and sun. 1 light year is the distance light travels in one year. Lecture 1 - our place in the universe.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents

Related Questions