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Thank you. and quote Science Podcast to receive special offers. Welcome to the Science Podcast for April 8, 2016.

I'm Sarah Cresby.

In this week's show, staff writer Jocelyn Kaiser talks about a potential new mechanism for the spread of cancer.

And David Grimm is here with a roundup of stories from our daily news site.

Support for the science podcast is provided by AAAS, the American Association for the Advancement of Science.

Now we have David Grimm, editor for our daily news site.

He's here to talk about some recent online stories.

First, we have a story on ancient supernovas.

This is something we've talked about before.

We are in constant danger from our neighbors.

At any time, all life on Earth could just be wiped out by a nearby exploding star. What are the chances that this might happen,

Dave? Well, they're not that great. It's thought that a stellar explosion that could actually

have lethal effects on Earth happens about one and a half times every billion years.

So that's a long time.

That's much longer than we've been around for sure.

And it looks like this may have already happened to our planet.

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