​Essential Question(s):

​

• How does our sun compare to other stars in the universe?

• How do stars change over time?

• How do stars form?

Before we start, you need to know certain vocabulary.

​


UNIVERSE- All of space and its components

GALAXY- a system of stars and associated matter, held together by gravitational attraction

CONTEXT

• Star – luminous globe of gas which produces its own heat and light by nuclear reaction

Stars burn hydrogen into helium. (mostly made of these 2)

​

What is a STAR?

​Its a big dust cloud.
Bigger than start, but smaller than a Galaxy

The Dust starts accumulating because of the gravity which creates a star.

It all starts in the NEBULA

​All stars begin in a cloud of gas

and dust called a

stellar nebula. ​

Gravity will cause the nebula to

contract.

The nebula will break into smaller

pieces. These pieces will

eventually form stars.

​

Life Cycle of a Star​

Is an average sized star...

• Its born in a NEBULA

• It will stay in this main sequence phase for a long time.

• When it starts to die it grows into a RED GIANT

  (same mass= law of conservation)

• Then it will go planetary nebula

• Then die as a white dwarf​

Our Sun

Vocabulary

Luminosity

Brightness

In an HR Diagram brightness Increases from bottom to top

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Temperature

In an HR Diagram​ temperature increases to the RIGHT

This is the Pillars of Creation within the Eagle Nebula, part of M16, viewed by the Hubble Telescope