SOAR Fall 2004 Earth’s place in the cosmos
Dec 18, 2015
Population of the CosmosPopulation of the Cosmos~100 Billion Galaxies =
1011 Galaxies~ 100 Billion Stars in
each galaxy = (1011 stars)
(1011 Galaxies)= 1022 stars
~ 10 planets around each star =
1023 planets … potentially lots of
company, but it’s very far away!
~100 Billion Galaxies = 1011 Galaxies
~ 100 Billion Stars in each galaxy = (1011 stars)
(1011 Galaxies)= 1022 stars
~ 10 planets around each star =
1023 planets … potentially lots of
company, but it’s very far away!
Earth-Moon DistancerEM = 250,000 miles
Earth-Sun Distance93,000,000 mi = 1 AU
(372 rEM = 1 AU)
Sun- Centauri Dist.4 ly = 4(63,200 AU)
(1 ly = 6x1012 mi)
Milky Way DiameterRMW = 100,000 ly
MW-Andromeda Dist.Rand = 2,000,000 ly
Farthest Galaxy Rfar = 11 Billion ly
Earth-Moon DistancerEM = 250,000 miles
Earth-Sun Distance93,000,000 mi = 1 AU
(372 rEM = 1 AU)
Sun- Centauri Dist.4 ly = 4(63,200 AU)
(1 ly = 6x1012 mi)
Milky Way DiameterRMW = 100,000 ly
MW-Andromeda Dist.Rand = 2,000,000 ly
Farthest Galaxy Rfar = 11 Billion ly
Scale of the CosmosScale of the Cosmos
= 264,000,000,000,000,000,000 rEM
= 264,000,000,000,000,000,000 rEM
Motion of EarthMotion of EarthRotation on axis
vEquator ~ 1000 mph, vCanton ~ 700 mph
Orbit about SolvEarth ~ 70,000 mph
Orbit about center of Milky WayvSun ~ 560,000 mph
Milky Way in Local GroupvMW ~ 280,000 mph
Local Group falling toward Virgo ClustervLG ~ 1,750,000 mph
Rotation on axisvEquator ~ 1000 mph, vCanton ~ 700 mph
Orbit about SolvEarth ~ 70,000 mph
Orbit about center of Milky WayvSun ~ 560,000 mph
Milky Way in Local GroupvMW ~ 280,000 mph
Local Group falling toward Virgo ClustervLG ~ 1,750,000 mph
The Milky Way GalaxyThe Milky Way Galaxy ~ 300 Billion Stars, some with planets
~ 300 Billion Stars, some with planets
The Milky Way GalaxyThe Milky Way Galaxy
Sun ~ 30,000 ly from centerGalactic Year ~225,000,000 yr (Sol is ~22)
Sun ~ 30,000 ly from centerGalactic Year ~225,000,000 yr (Sol is ~22)
M87, a galaxy much like the Milky Way
http://www.eso.org/outreach/press-rel/pr-1999/pr-18-99.html
Solar SystemSolar System Sun & Planets formed from
interstellar clouds collapsing under gravity
Sun & Planets formed from interstellar clouds collapsing under gravity
Solar SystemSolar
System
Inner Worlds: Mercury, Venus, Earth, Mars
Inner Worlds: Mercury, Venus, Earth, Mars
Positions at 17:00 UT, 1/23/04
1 AU = 150,000,000 km= 93,000,000 mi