Space

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What is a star?

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A star is a massive, luminous sphere of plasma held together by gravity, undergoing nuclear fusion in its core.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

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What is the HR diagram?

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The Hertzsprung-Russell diagram is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

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NGSS.HS-ESS1-3

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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 neutron star?

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A neutron star is the remnants of a supernova explosion, composed almost entirely of neutrons, and is incredibly dense.

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What is a black hole?

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A black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

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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 after it has exhausted its nuclear fuel.

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What is the life cycle of a massive star?

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The life cycle of a massive star includes stages such as main sequence, red supergiant, supernova, and then either a neutron star or black hole.

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NGSS.HS-ESS1-3

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What is luminosity?

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Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

Tags

NGSS.HS-ESS1-1

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What is the difference between a giant star and a supergiant star?

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Giant stars are larger than main sequence stars but smaller than supergiants, while supergiant stars are among the largest stars in the universe, with much greater luminosity.

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What is dark matter?

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Dark matter is a form of matter that does not emit light or energy, making it invisible and detectable only through its gravitational effects.