This episode of Astronomy Cast is sponsored by Casper.

Get $50 towards Selector mattresses by visiting

Casper.com slash Astro and using promo code Astro at checkout.

Terms and conditions may apply.

Now, it may seem a little bit weird

that this astronomy podcast has been sponsored

for so long by a mattress company.

But the thing is, Fraser and I both adore our Casper mattresses.

Both of us started out with our own 100-day trial

of a mattress that both of us, Canada and the USA,

could get a free return on or free shipping on the return

more to the point.

And we kind of fell in love and have ended up

buying more mattresses over the years

and slowly filling our separate houses.

And I've actually upgraded from my Casper original

to having a Casper wave, which is a mattress

that has various densities in various places

to shape all the curves and crevices of the body

to make sure that everything is supported,

the way it needs to be supported

for the natural shape of your body.

...