How small are we in the scale of the universe? - Alex Hofeldt

source: TED-Ed    2017年2月13日
View full lesson: http://ed.ted.com/lessons/how-small-a...
In 1995, scientists pointed the Hubble Telescope at an area of the sky near the Big Dipper. The location was apparently empty, and the whole endeavor was risky – what, if anything, was going to show up? But what came back was nothing short of spectacular: an image of over 1,500 galaxies glimmering in a tiny sliver of the universe. Alex Hofeldt helps us understand the scale of this image.
Lesson by Alex Hofeldt, animation by Bliink.
Hubble Deep Field Image Credit: R. Williams (STScI), the Hubble Deep Field Team, and NASA.