Crash Course Astronomy | Distances: Crash Course Astronomy #25 | Episode 25 | PBS
By Owner - Crash Course Astronomy - Powered By PBSFrom Pbs OrgSeptember 6, 2025
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.
#Light-year
#Parallax
#Angle
#Telescope
#Star
#Measure
#Shift
#Baseline
#Earth
#Distance