The Universe

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What is the Big Bang?

Back

The Big Bang is the theory that describes the origin of the universe as an expansion from a singular point, leading to the formation of galaxies, stars, and planets.

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What does red shift indicate in astronomy?

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Red shift indicates that an object in space, such as a star or galaxy, is moving away from the observer, causing the light to stretch and appear redder.

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What does blue shift indicate in astronomy?

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Blue shift indicates that an object in space is moving toward the observer, causing the light to compress and appear bluer.

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What is a space probe?

Back

A space probe is an unmanned spacecraft designed to travel out of Earth's orbit to collect data and send information back to scientists.

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What is cosmic microwave background radiation?

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Cosmic microwave background radiation is the afterglow radiation from the Big Bang, providing evidence that the universe was once in a hot, dense state.

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What is a galaxy?

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A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

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What is the observable universe?

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The observable universe is the part of the universe that we can see and measure, limited by the speed of light and the age of the universe.

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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, but it exerts gravitational effects on visible matter.

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What is a supernova?

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A supernova is a powerful and luminous explosion of a star, marking the end of its life cycle, often resulting in the formation of a neutron star or black hole.

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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.