celestial objects solar system objects –sun, moon, planets and their moons galactic objects...
TRANSCRIPT
Celestial Objects• Solar System Objects
– Sun, Moon, Planets and Their Moons
• Galactic Objects– Star Formation Regions
– Open Clusters
– Globular Clusters
– Planetary Nebulae
– Supernova Remnants
• Extra-galactic Objects– Galaxies
Celestial Objects• Solar System Information
• The brightest examples of Celestial Splendors
http://www.seds.org/messier/Messier.html
http://www.seds.org/nineplanets/nineplanets/intro.html
Earth’s Moon• Complete set of phases over 29.5 days
– (27.3 day orbital period)
Planets• Planos = Wanderer among the fixed stars• Bright disk (non stellar) in small telescopes
Milky Way Galaxy• The Milky Way center in
the direction of Sagittarius
• A comet, nature’s own
cosmic dirty snowball.
Open Cluster• Thousands of stars, sometimes gravitationally bound
• Contain the youngest, hottest galactic stars
• Associated with star formation regions in the galaxy.
Globular Cluster• Hundreds of thousands of stars, gravitationally bound and
spherically symmetric.
• Contain the oldest galactic stars
• Symmetrically distributed
about the galaxy.
Star Formation Regions• Giant clouds of gas and dust
(mostly Hydrogen and Helium)
Planetary Nebula• Hydrogen rich atmosphere from a dying solar-type star
• Central core of nebula (white-dwarf)
Supernova Remnant• Stellar Explosion Leftovers• Star Guts
Spiral Galaxies• Millions upon millions of stars
• Star forming regions abound• Globular clusters identified
Elliptical Galaxies• Millions upon millions of stars
• Resemble Globular Clusters
only on a Galactic scale.
• No spiral structure, very little star formation