🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
HomeTextbook Notes300,000CA170,000

AST101H1 Chapter Notes - Chapter 1: Small Solar System Body, Milky Way, Galaxy Cluster

18 views6 pages
puceherring986
21 Oct 2017
School
UTSG
Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Bryan Gaensler

For unlimited access to Textbook Notes, a Class+ subscription is required.

elizabethkandelaki and 39782 others unlocked
AST101H1 Full Course Notes
23
AST101H1 Full Course Notes
Verified Note
23 documents

Document Summary

Earth is a planet orbiting the sun. Our sun is one of more than 100 billion stars in the milky way galaxy. Our galaxy is one of more than 70 galaxies in the local group. The local group is one small part of the local supercluster, which is one small part of the universe. Sirius, the brightest star in the night sky is located about 8 lightyears away. Therefore, we see sirius not as it is today, but rather what it looked like 8 years ago. The farther away we look in the distance, the further we look back in time. A large, glowing ball of gas that generates heat and light through nuclear fusion in its core. A moderately large object that orbits a star and shines primarily by reflecting light from its star. Is large enough for its own gravity to make it round. Has cleared most other objects from its orbital path.

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

AST101H1
Final Exam
Study Guide
AST101H1 Study Guide - Midterm Guide: Milky Way, Virgo Supercluster, Local Group
limeimpala355
AST101H1
Final Exam
Study Guide
AST101H1 Final: Complete and Comprehensive 60 Page Final Exam Study Guide - Fall 2015
cerisegiraffe538
AST101H1 Lecture : chapter 1
sangriareindeer116

Related Questions

Which of the following correctly lists our "cosmic address" fromsmall to large?

a.) Earth, solar system, Milky Way Galaxy, Local Group, LocalSupercluster, universe

b.) Earth, solar system, Local Group, Local Supercluster, Milky WayGalaxy, universe

c.) Earth, Milky Way Galaxy, solar system, Local Group, LocalSupercluster, universe

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light-years (Mly), where a light-year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.