DOC PREVIEW
UMD
ASTR 100 -
Lecture Extra Credit #1
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Unformatted text preview:
View Full Document
February 3, 2005Lecture Extra Credit #1List in order of increasing size: Pay attention to units!Diameter of the Sun (Radius ~ 696,000 km)696,000 kilometersDistance between the Earth and Sun (1 AU ~ 1.496 x 10^8 km)149,600,000 kilometersDistance to nearest star from the Sun (Proxima Centauri 4.2 light years) 1 light year ~ 9.46 x 10^12 km4.2 ly 9.46e12 km x -------------- = 3.97e13 km ly39,700,000,000,000 kilometersDiameter of our Galaxy ~ 30 kiloparsecs (1 kpc = 3.26 x 10^3 light years)30 kpc 3.26e3 ly 9.46e12 km x -------------- x ---------------- = 9.25e17 km kpc ly925,000,000,000,000,000 kilometersDiameter of the Universe
View Full Document
Unlocking...