[Marc]

James [2]

The size of the universe and how the smallest things in the world fit in it. Also the oceans; the thought of how large and calm but severely dangerous they can be. My worst fear would be to be stranded in the middle of an ocean; it's scares me

[Z]

Space/air travel, and stuff like black holes, light years, faster than the speed of light/sound...

[Livia]

"Hubble's new photo is the most high-resolution image ever taken of Messier 9, and reveals the ancient cluster as never before. So many details of the stars are visible, despite the fact that the whole image spans an area no bigger than the size of the head of a pin held at arm's length."

http://www.space.com/14930-star-clus...telescope.html

[GypsyGoth]

Originally Posted by James

The scale of things - the size of the universe. Also at the other end of the scale how small particles like atoms are. Also that an atom is mainly empty space.

Also the diversity and complexity of life on this planet and how it all evolved.

This

[Z]

That image is unbelievable Livia!