And then of course depends on where you choose.
So in Orion,
typically I think those stars would be few hundreds of parsecs away from us.
And the size of Orion, it's in tens of degrees,
so one gradient is fifty some degrees, so
those would be like small fraction of a radian, let's call it tenth of a radian.
And so then the distance to Orion would be ten times a couple hundred degrees.
A couple hundred parsecs.
That's about right.
Constellations are something that used to be popular,
they are just expression of Human need to see patterns in the sky,
patterns anywhere, stock market, sky, doesn't matter.
And they are arbitrary, they are just mnemonic device,
used to help people navigate and also set up the calendars.
They also produced very productive industry of astrology.
Which is making lot of money out of nothing.
And some death sentences like Facebook, right?
>> [LAUGH] >> But
constellations do not have physical meaning.
We still use them in some cases, because originally when
astronomers started charting the sky, they started giving names to stars and
other things according to in which constellation they happened to be, so
a star will be called Alpha Signi or something like that.
And a variable star might be called a [INAUDIBLE] and so on and so forth.
Okay, so let's step even further.