Word Bank: Mass, massive, Neutron, Main Sequence, Luminosity, Temperature, Brightness, Stable, Red Giants, Super Giants, Cepheids, Supernova, Black Holes, Neutrons, White dwarf, HR Diagram, Stable

Stars can be classified according to their surface and their (how brightly they shine)
Most stars fall on the Hertzberg-Russell (HR) diagram.
These stars are relatively .
About 90% of stars are and . which shine brightly but at a low temperature, so with a large volume.
are very hot and small, and don't shine and very brightly.
A group of unstable stars called appear between the main sequence and the red giants.
What happens next to a star depends on its birth .
Very high mass stars can become and they finally either stars or

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Stars can be classified according to their surface Temperature

and their Luminosity (how brightly they shine)

Most stars fall on the Main Sequence Hertzberg-Russell (HR) diagram.

These stars are relatively Stable

About 90% of stars are Red Giants

and Super Giants. which shine brightly but at a low temperature, so with a large volume.

White dwarf are very hot and small, and don't shine and very brightly.

A group of unstable stars called Cepheids appear between the main sequence and the red giants.

What happens next to a star depends on its Mass birth .

Very high mass stars can become Supernova and they finally either Neutron stars or Black Holes

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.