BAILEY PRESUTTI LUKE WILDMAN

COLORS OF STARS

• Cool colors are hotter then bright colors
• Sometimes stars are different colors
• Red glowing embers are hotter then candle's yellow flames
• Betelgeuse is red and rigel is blue and its easier to see them in witer months

COMPOSITION OF STARS

• There is a rainbow of colors called a spectrum
• A hot solid object give off a continuous spectrum
• Stars don't continuous spectrum
• You can use a prism to spread sunlight
• Stars give off spectra that are different from light builbs

CLASSIFYING STARS

• In 1800s people started collecting spectra of stars to help classifying
• Classified by how hot they are
• By patterns
• Class O is the original class
• Blue is the ottest of all stars

BRIGHTEST OF STARS

• Stars are brighter because of their size or energy output
• Its not the same as it seems on earth
• Absolute is the actual brightness of a star
• The sun has an absolute magnitude of 4.8
• Sun brightest object in the sky

DISTANCE TO THE STARS

• A light-year is the distance that light travels
• Speed of light is 300,000km
• North Star as 431 light-years than 4,080,000,000,000,000km
• The shift can only be seen in a telescope
• Stars by the earth move by more-distant

MOTIONS OF STARS

• The earth rotates on its axis and thats how we have night and day
• Sun the sun moves acrossed the sky
• You see different stars because the earth turns
• The rest of stars appear go rotate around polaris
• The stars start to move when they get older

TYPES OF GALAXIES

• Spirt galaxies are what people mostly think of galaxies
• THe central region appears yellow
• One-third of all galazies are slimply massive blobs of stars
• Some of the galaxies are shaped of cucumbers
• These galaxies are called elliptical galaxies

CONTENT OF GLALAXIES

• Galaxies are composed of billions and billiona of stars
• Some kind of clouds glow by themselves
• Open clusters are a group of stars that are located around the spiral disks
• The latin word for cloud is nebula
• The are a few hundred of thousands of stars in the open custer

ORIGIN OF GALAXIES

• The most distant object are quasars
• They are very far away
• Quasars are among the most powerful energy sources
• quasares look like tiny points of life
• quasars are very bright

THE BIG BANG THEROY

• Most important theroy
• They think the universe started with a big explosion
• Than it rapidly expended
• All the contents were all togather at one point
• Expanding energy turned into matter than it created the glaxies

UNIVERSAL EXPANSION

• Glaxies are moving away from us
• The unervers is contracting not expanding