So What All Is Out There, Anyway?

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Distances in Space.

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Presentation transcript:

So What All Is Out There, Anyway? The untold story of Alice’s Adventure in Wonderverse

She went on growing, and growing, and very soon had to kneel down on the floor: in another minute there was not even room for this . . .

She looks down and sees Earth

The Moon comes into view

Soon she can see the Sun . . .

. . . and the other inner planets

There’s the asteroid belt!

The outer planets . . .

. . . the Kuiper Belt . . .

. . .and the Oort Cloud comprise our solar system

The closest star, Proxima Centauri, is a red dwarf 4 light years (LY) away

Other stars with planetary systems

Our galaxy, the Milky Way, is ~100,000 LY across

Clusters of galaxies: Our Local Group

Clusters of galaxies: The Virgo Cluster

Superclusters of galaxies

Filaments of Superclusters

Distance = Time Proxima Centauri is ~ 4 LY away. Light leaving star takes 4 years to arrive at Earth. Result: We see Proxima Centauri as it looked 4 years ago!

The Sun 8 Minutes Ago

The Andromeda Galaxy 2.2 million years ago

NGC 1399, 65 Million Years Ago

Just Suppose: What might we see? There is a planet in NGC 1399 That planet is exactly like Earth We could see that planet from Earth What might we see?

Abell 1825 13.2 billion years ago