Stars

Stars

Stars – A large body that produces a lot of energy

Why do stars twinkle?

There are particles in our atmosphere that are moving around.  They pass between our eyes and the stars, so they look as if they are blinking but in reality they don’t blink.

White Dwarf Stars – stars that are in the process of dying.

Variable Star – when its energy and heat varies: sometimes it is hot and bright, and at times, it produce less heat and dim.

Why do stars die? Stars die when the fuel that they use for thermonuclear fusion runs out.

STAR CATEGORYColor / TemperatureBrightness LevelEnergy Level / LuminosityO – Blue;  Hottest1 – BrightestI – SupergiantB – Bluish white2II – Bright GiantA – White3III – GiantF – Yellowish White4IV – SubgiantG – Yellow5V – Main SequenceK – Orange6VI – Sub-dwarfM – Red; Coolest7VII – White Dwarf89 – Dim

http://en.wikipedia.org/wiki/List_of_brightest_stars

Examples:

1. Our Sun = G 5 V

2. Sirius = A 1 V

3. Betelgeuse =M 2 I – Super giant

Light Speed = 186,000 miles / seconds

Light travels 93M miles

In just 8 minutes

Light travels 484M miles

In just 30 minutes