# Spaceships and astronomy

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**316****Re: Spaceships and astronomy**

I think it's something to do with whether the internal angles of triangles add up to 180 degrees. in a flat universe, they do.

Take a sheet of paper. Draw a triangle on it, using straight edges and stuff. The internal angles add up to 180 degrees.

Now wrap that paper around a large toilet roll. The paper seems curved, but the angles of the triangle drawn on it still add up to 180 degrees. It's flat.

Draw a triangle on the surface of a smooth sphere. The internal angles of that triangle will add up to more than 180 degrees. Not flat.

I think that's it.

I could be wrong. I'moften a figment of mu own imagination - never somebody else's...

Take a sheet of paper. Draw a triangle on it, using straight edges and stuff. The internal angles add up to 180 degrees.

Now wrap that paper around a large toilet roll. The paper seems curved, but the angles of the triangle drawn on it still add up to 180 degrees. It's flat.

Draw a triangle on the surface of a smooth sphere. The internal angles of that triangle will add up to more than 180 degrees. Not flat.

I think that's it.

I could be wrong. I'moften a figment of mu own imagination - never somebody else's...

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**317**BE Forum Addict

Joined: Jun 2010

Posts: 2,847

**Re: Spaceships and astronomy**

Or more.

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**318****Re: Spaceships and astronomy**

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**319****Re: Spaceships and astronomy**

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**320****Re: Spaceships and astronomy**

That reminds me of the story of the great mathematician (to be) CF Gauss, who, as a child, was told to add all the numbers from 1-100 up - the teacher expecting it to take all lesson. Gauss did it in a couple of minutes, got it right, and explained the method. He wasn't popular either....

All I know is that bluddy easter egg was not worth the misery that dreadful man put me through for a long time afterward. When it was finally sneeringly & begrudgingly given to me, I gave it away. Shame, as treats like that were very few and far between at home.

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**321****Re: Spaceships and astronomy**

Incidentally, I recommend the numberphile videos and their associated families in physics, computing and other fields to anyone, they're a great watch.

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**322**
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**323****Re: Spaceships and astronomy**

Lots of great astronomy content on their associated channel Deep Sky Videos, too.

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**324****Re: Spaceships and astronomy**

I was going to sketch this, but the best explanation I've found that I can point you at is Laurence Krauss' book

https://www.amazon.com/Universe-Noth.../dp/1451624468

https://www.amazon.com/Universe-Noth.../dp/1451624468

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**325**Forum Regular

Joined: Jul 2018

Location: California

Posts: 166

**Re: Spaceships and astronomy**

https://time.com/5802128/alexei-leon...wsletter-brief

"

I doubt if they would've been too unhappy!

"

*They eventually reached solid ground — however, after emerging from the craft they realized, cruelly, they were in a thick forest surrounded by wolves and bears, in a snowstorm.*"I doubt if they would've been too unhappy!

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**326****Re: Spaceships and astronomy**

https://time.com/5802128/alexei-leon...wsletter-brief

"

"

*They eventually reached solid ground — however, after emerging from the craft they realized, cruelly, they were in a thick forest surrounded by wolves and bears, in a snowstorm.*"*Last edited by steveq; Mar 25th 2020 at 1:52 am. Reason: Spelling !*

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**329****Re: Spaceships and astronomy**

They will try again on Saturday 30 May at 15:22 local time.