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Black Holes

Black Holes. Black Holes. Supermassive stars (5-30 times the mass of the sun), will collapse under the force of gravity which is so strong that nothing can escape its pull – not even light . They become black holes . Black holes come in a variety of sizes:.

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Black Holes

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  1. Black Holes

  2. Black Holes Supermassive stars (5-30 times the mass of the sun), will collapse under the force of gravity which is so strong that nothing can escape its pull – not even light. They become black holes.

  3. Black holes come in a variety of sizes: Mini black holes – event horizons no larger than an atomic nucleus Regular black holes – event horizons 10 – 50 km across Supermassive black holes – event horizons billions of miles across

  4. If no light can escape a black hole, how can we “see” them to know they really exist? Black holes pull in swirling clouds of gas from neighboring stars. These gasses move so fast they become hot. Very hot objects give off streams of X Rays. When astronomers see a strong X ray source, but no star is visible at that location, they figure it must be a black hole – a massively huge star that has collapsed under its own weight and “winked” out of visibility.

  5. Approaching a Black Hole Tidal forces are caused by gravity pulling with different degrees of force on objects which are different distances from the gravity source.

  6. Approaching a Black Hole Example: The center of the Earth is 4,000 miles further from the moon than the oceans. The moon’s gravity pulls on the oceans harder, causing tides.

  7. Approaching a Black Hole Black holes have an incredibly huge masses packed into an incredibly tiny point called a singularity. This causes the force of gravity to skyrocket.

  8. Approaching a Black Hole • As a result, the distance needed to create a noticeable tidal force is very small. • A 6’ human approaching a black hole would have much greater gravity pulling on his feetthan his head. The tidal forces would stretch him like Gumby. This would actually pull the person apart (as well as his spacecraft as he approached the Event horizon.

  9. The Event Horizon The event horizon is the edge or boundary of the black hole – the “point of no return.” (And no escape.)

  10. Approaching a Black Hole All matter which passes the event horizon is trapped inside the black hole forever If a spaceship reached this point intact, it would not be able to send signals back – the radiowaves and microwaves would be pulled back by the black hole’s immense gravity. From a distance, the space ship would appear to be permanently hovering on the event horizon. Once inside the event horizon, all matter is shredded and compressed down to a single point called the singularity.

  11. Beyond Black Holes……………….. The black hole could become a wormhole, a passageway meandering across space/ time and connecting with a black hole in another universe.

  12. Beyond Black Holes……………….. Another possibility is a white hole, spewing out cosmic debris in another corner of the universe.

  13. Beyond Black Holes……………….. These odd features are all mathematically possible but may not actually exist. Black holes do exist, on the other hand and are quite common in the universe.

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