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Astronomy Cast Episode 669 challenges to dark energy. Welcome to Astronomy Cast, where

you speak and translate.

just for the planetary science institute and the director of Cosmic Quest.

Hey Pamela, how are you doing?

I am doing well.

The third episode of our new TV show aired Saturday.

And we got it to the station 90 minutes before it was due to computer crashes because

computers know.

But if you haven't checked it out yet, it's escape velocity space news.

It airs on now media.

I'm going to be putting together a podcast version and loading that up later today.

Congratulations.

That's amazing.

It's been over 20 years since astronomers first discovered that the expansion of the

universe is accelerating thanks to dark energy.

...