Betelgeuse Rigel Hydrogen Helium Neon Sodium Mercury.
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Transcript of Betelgeuse Rigel Hydrogen Helium Neon Sodium Mercury.
Twinkle, twinkle, litt le star, how I wonder what
you are?
What are stars?And what are they made of?
Stars are huge, hot, bright balls of gas.Stars have diff erent temperatures.Stars are of diff erent colors.Stars are made of diff erent elements.
Betelgeuse
Rigel
Which star is hott er?
Stars are of diff erent colors.
Compositi on of StarsStars are made of diff erent elements in the form of gases.
A star is very dense and hot.The outer layers of a star (atmosphere) are made of cooler gases (elements).
The elements emit certain wavelengths of light (fi ngerprints)
The Fingerprints of Elements
Emission Spectral Lines
Hydrogen
Helium
Neon
Sodium
Mercury
It is a group of billions and billions
of stars held together by gravity.
What is a Galaxy?
Top View
• Huge; contains stars, gas, and dust• Held together by gravity• Pinwheel shape/looks like a hurricane• Bulge and thin disk• Halo (glow) is present• Rich in gas and dust• Young and old stars are present
Side View
Bulge
Disk
Spiral Galaxy
Spiral Galaxy
Spiral Galaxy
Spiral Galaxy
Spiral Galaxy
Elliptical Galaxy
•Huge; contains stars, gas, and dust
•Held together by gravity•Round to oval•Bulge but no disk•Halo is present•Little cool gas and dust•Mainly OLD STARS are present
Elliptical Galaxy
Elliptical Galaxy
Elliptical Galaxy
Elliptical Galaxy
Irregular Galaxy
• Huge; contains stars, gas, and dust
• Held together by gravity• No regular shape• May show signs of a disk and/or bulge
• Halo is present• Usually rich in gas and dust• Young and old stars are present
Irregular Galaxy
Irregular Galaxy
Irregular Galaxy
Nebulae
Planetary Nebula
(death of a star)
Movie
Stellar Nebula (where stars are
born)
Stellar Nebula
Stellar Nebula
Stellar Nebula
Stellar Nebula
Planetary Nebula
Planetary Nebula
Planetary Nebula
Planetary Nebula
Colliding Galaxies
Betelgeuse
Rigel
Orion Constellation
Supernovae
Spiral Galaxy
Huge: contain stars, gas, and dust
Huge; contain stars, gas and dust
Huge; contain stars, gas, and dust
Held together by gravity
Held together by gravity
Held together by gravity
Pinwheel shape Round to oval in shape
No regular shape
Bulge and thin disk; halo is present
Bulge but no disk; halo is present
May show signs of a disk and/or bulge; halo is present
Rich in gas and dust Little cool gas and dust
Usually rich in gas and dust
Young and old stars are present
Mainly old stars are present
Young and old stars are present
Top View Side View
Elliptical Galaxy Irregular Galaxy
