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Distances: Crash Course Astronomy #25

Season 1 Episode 25 | 11m 20s

How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the distance to and the sizes of the Moon and Sun.

Aired: 07/15/15
Extras
Phil gives the course a send off with a look at some of his favorite topics.
Our Universe’s days are numbered.
Thanks to the wonders of physics, we can map a timeline of the universe’s history.
Most of the universe is made up of a mysterious entity that pervades space: dark energy.
Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!
Today on Crash Course Astronomy, Phil dives into some very dark matters.
The discovery of gamma-ray bursts is an epic story.
Active galaxies pour out lots of energy.
Galaxies contain gas, dust, and billions of stars or more.
Latest Episodes
Phil gives the course a send off with a look at some of his favorite topics.
Our Universe’s days are numbered.
Thanks to the wonders of physics, we can map a timeline of the universe’s history.
Most of the universe is made up of a mysterious entity that pervades space: dark energy.
Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!
Today on Crash Course Astronomy, Phil dives into some very dark matters.
The discovery of gamma-ray bursts is an epic story.
Active galaxies pour out lots of energy.
Galaxies contain gas, dust, and billions of stars or more.
Today we’re talking about our galactic neighborhood: The Milky Way.