Our solar system is very big.

Voyager has taken some thirty five years to reach the edge of it, travelling at 10.5 mi/s.

It’s now between solar systems, and will take 10000 years to reach the next one.

In our galaxy there 200 billion solar systems. But ours is just one galaxy in a much larger universe.

In the whole Universe there are the hundred billion galaxies.

It’s Carl Sagan’s birthday.

If you’ve not watched Cosmos, I urge you to. He’s like an infinitely better Brian Cox, and with a deeply philosophical understanding, and and eloquent and compelling wisdom.

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