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Lecture 2 Astronomy Today. 1 nanosecond = 1 ft. (1/1,000,000,000 second ). Light Speed = 299,792,458 meters/second. Using Light to Measure Distance. Earth to Moon = 1.28 light seconds. Light Speed = 299,792,458 meters/second. Using Light to Measure Distance.

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Presentation Transcript
slide1

Lecture 2

Astronomy

Today

slide2

1 nanosecond = 1 ft

(1/1,000,000,000 second)

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance

slide3

Earth to Moon = 1.28 light seconds

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance

slide4

Sun to Earth = 8.33 light minutes

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance

1 AU

(Astronomical Unit) =8.33 light minutes

slide5

Sun to nearest star = 4.23 light years

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance

slide6

1 AU

1 arc second = 1/3600 degree

1 pc

Astronomers and Cosmologists use Parsecs

A More

Professional

Unit of

Distance

1 pc = 3.26 ly

1 parsec (pc)

slide7

Survey of

Astronomy

The

Milky Way

Eagle Nebula

North America

Nebula

Flaming Star

Nebula

slide8

The Milky Way

as seen by

Radio telescopes

The Milky Way

as mapped

by all types

of telescopes

slide9

The Entire

Milky Way

Galaxy

slide10

Large Magellanic Cloud

160,000 ly

Andromeda (M31) 2.5 ly

Small Magellanic Cloud

200,000 ly

Galaxies in the

Neighborhood

of the

Milky Way

Galaxy

slide11

Clusters of

Galaxies

Virgo Cluster - 53,000,000 ly

slide12

Galaxies

Deep in the

Universe

10,000,000,000 ly

slide13

Distribution

of Galaxies

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR

slide14

Schematic diagram showing the position of a typical galaxy within the cosmic web

The

Cosmic Web

R. A. Ibata et al., Science 319, 50 -52 (2008)

Published by AAAS