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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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Astronomy today

Lecture 2

Astronomy

Today


Astronomy today

1 nanosecond = 1 ft

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

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance


Astronomy today

Earth to Moon = 1.28 light seconds

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance


Astronomy today

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


Astronomy today

Sun to nearest star = 4.23 light years

Light Speed = 299,792,458 meters/second

Using Light to Measure Distance


Astronomy today

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)


Astronomy today

Survey of

Astronomy

The

Milky Way

Eagle Nebula

North America

Nebula

Flaming Star

Nebula


Astronomy today

The Milky Way

as seen by

Radio telescopes

The Milky Way

as mapped

by all types

of telescopes


Astronomy today

The Entire

Milky Way

Galaxy


Astronomy today

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


Astronomy today

Clusters of

Galaxies

Virgo Cluster - 53,000,000 ly


Astronomy today

Galaxies

Deep in the

Universe

10,000,000,000 ly


Astronomy today

Distribution

of Galaxies

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


Astronomy today

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


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