Black Holes

Black HolesThe intense gravitational field left when a giant star collapses

It is called a black hole because not even light can escape

Photon Sphere

The outer edge where light bends but is still escapable

Event HorizonThe point at which no light can escape

SingularityThe shrunken star too small to be measured but with indefinite density

Galaxies

GalaxyA large assembly of stars and nebulae

Group of Galaxies

The Milky WayOur galaxyFlat disk with spiral arms

Three Types of Galaxies

EllipticalOval shapedMost common type of galaxy found

Contains little gas and dustMost are dim and difficult to see

Spiral Dense center with spiral armsBright and easy to see

Contains large amounts of gas and dust – always producing new stars

IrregularNo specific shapeContains large amounts of gas and dust

Small and faint therefore hard to see

Quasars

QuasarsSmall, powerful source of energy thought to be cores of distant spiral galaxies

They emit radio waves and bright light

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