AS101 Study Guide - Midterm Guide: Tropical Year, Star Cluster, Declination

38 views20 pages
29 Nov 2012
School
Department
Course
Professor
Astronomy (Lecture 1) Luke MacKenzie
- Mostly vacuum (empty space)
- Everything we can possibly see is a tiny fraction
The Sun is Our Star:
- massive ball of glowing gas that generates energy through nuclear fusion
- 100x as wide as the Earth
- source of almost all energy on Earth
Planets:
- are less massive than stars
- non-luminous and spherical
- in orbit around a star
Exoplanets:
- over 600 planets confirmed to be orbiting other stars
- thousands of “candidate” exoplanets, observed by the Kepler Space
Telescope
Some planets have satellites (an object in orbit around a planet)
- natural satellites are also known as “moons”
Asteroid:
- a small, rocky object orbiting a star
Comet:
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 20 pages and 3 million more documents.

Already have an account? Log in
- a small, icy object orbiting the sun
Galaxies: “cities” of the Cosmos:
- a large system of stars, dark matter, gas, and dust, all bound together by
their combined gravity
Nebulae:
- clouds of gas and/or “dust”
- raw materials for new stars from previous generations
Star clusters:
- Open clusters: 1000s of stars
- Globular clusters: 100000s of stars
- Our Sun probably formed in an open star cluster but has since “moved out
Galaxy groups and clusters:
● a group of galaxies (a few dozen up to thousands) all held together
gravitationally
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 20 pages and 3 million more documents.

Already have an account? Log in
Many clusters form a Supercluster:
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 20 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Grade+

Unlimited access to all notes and study guides.

Grade+All Inclusive
$10 USD/m
You will be charged $120 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.