The Big Bang, Galaxies, and Stars

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What is the Big Bang Theory?

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The Big Bang Theory is the leading explanation for the origin of the universe, proposing that it began as a singularity approximately 13.8 billion years ago and has been expanding ever since.

Tags

NGSS.HS-ESS1-2

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What are the three main types of galaxies?

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The three main types of galaxies are Spiral, Elliptical, and Irregular.

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What characterizes a Spiral Galaxy?

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A Spiral Galaxy is characterized by its flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars known as the bulge.

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What is an Elliptical Galaxy?

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An Elliptical Galaxy is a type of galaxy that has an ellipsoidal shape and lacks the distinct features of spiral galaxies, often containing older stars and little gas.

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What defines an Irregular Galaxy?

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An Irregular Galaxy does not have a distinct regular shape, often appearing chaotic and containing a mix of young and old stars.

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What is a constellation?

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A constellation is a group of stars that forms a recognizable pattern in the night sky, often named after mythological figures, animals, or objects.

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What is the life cycle of a star?

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The life cycle of a star includes stages such as nebula, main sequence, red giant, and final stages like supernova, neutron star, or black hole, depending on the star's mass.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

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What is a black hole?

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A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it, formed from the remnants of a massive star after a supernova.

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What is a supernova?

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A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, often resulting in the formation of a neutron star or black hole.

Tags

NGSS.HS-ESS1-3

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What is a white dwarf?

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A white dwarf is a small, dense star that is the remnant of a low to medium mass star, which has exhausted its nuclear fuel and shed its outer layers.