# Distances

I like knowing things, so I thought I would look u some measurements.

The shortest distance on earth I could find was the thinnest section of the crust of the Earth which is only under the deep oceans and is mainly made up of iron bearing rock. That is about 5km.

But the thickness of the Earth’s crust varies between 5km and 70km, so the average would be about 35 kilometers. To give you an idea of how far that is, it’s approximately the same as Dover to Calais, which is 33.3km.

The distance from the Earth’s surface to space is 100 kilometers. Or three times the distance from Dover to Calais.

Going up in size, the distance from the Earth’s surface to the centre of the Earth is 6,371km. Which is 63 times the distance to space.

Now we go a bit further. The escape velocity from Earth is 11.19 kilometers per second. That is the slowest speed something would have to move to fly up into space and leave Earth’s gravity for good. The more massive the object, the more effort it would take to leave the gravity well of an object. So a gas giant planet is huge compared with the Earth but is less dense on average. I don’t know the figures. I didn’t look them up, but I read that if we were as big as Saturn it could gloat on our sea?

Going further out, the Moon, which is the furthest human beings have travelled to after reaching escape velocity is 384,400km away.

If you want to travel to the Sun the distance is 150,800,000 kilometers….

But man-made objects have gone further. We have sent probes into the vastness of space. Voyager Two has left the Solar system and is currently about 18,603,199,501 kilometers away. In distance at the speed of light that’s 17 hrs 14 minutes and 13.5 seconds (approximately) as of yesterday.

Of ccourse that’s nothing compared with the nearest star to our Sun. Which is about 4 light years away from the Solar system. And then… Space is infinite…

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