Solar System 8.3 light minutes from sun-earth (93m miles) Sun - 99.86% of the mass Hottest planet is Venus, 900F Europa (Jupiter) may have liquid water beneath an ice crust Tallest mtn is on Mars, 88,000 feet Mercury may have a 10-mile thick diamond layer What's missing?
	Earth from Saturn Cassini image (746 million miles away) 746 million to 1 billion miles Elliptical orbit Earth can be on either side of the Sun
	Milky Way 88,000 ly across 100-400 billion stars 450 million years to get to center by rocket Super black hole at center     50 billion x mass of Sun Andromeda Galaxy will collide about 4by
	Local Group
	Stephen's Quintet (L) 300 mly Deer Lick Group (R) NGC 7331 the largest Galaxy Like Milky Way 50mly away
	Universe (not to scale) Solar System in middle Cosmic Basckground Radiation around edge: farthest away 93 billion light-years across About 15 byo 2 trillion galaxies (est.) Expanding, speeding up 1,000,000,000,000,000,000,000,000 stars     1 septillion, 10^24     nobody really knows Space is completely silent
	Messier 51, Whirlpool Galaxy Hubble photo 23.5 mly away 24,000ly across Similar to Milky Way, smaller
	"Pillars of Creation" Hubble photo About 7,000 ly away In the Eagle Nebula (about 70x55 ly) Gas, dust, new stars Each pillar 4-5 ly tall
	"Butterfly" Nebula Hubble photo Wingspan ly Sun = 400,000F degrees About 4,000 ly away
	"The Mice" Hubble photo Colliding Galaxies About 300 mly away Will eventually merge as one galaxy