loud speaker

3/31/2022- Use the coupon code "spring" to get MrN 365 - which now includes our Reading Comprehension Assessment System and other new features for 60% off of the normal price of $79 per year. Just $31.60 for the WHOLE YEAR. Visit https://mrn365.com to get started!

arrow up
Home > Science > Black Hole

Black Hole

This page tells all about mysterious, powerful, and possibly world-ending black holes.

Black Hole

a jet from a black hole striking a galaxy - gov.us (Public Domain)

What is a Black Hole?

The mysterious black hole is thought to be the most powerful force in the universe. A black hole is a region of space with a gravitational force so powerful that nothing, including light, can escape it. It is defined as an incredibly dense region of space in which the escape velocity exceeds the speed of light. Escape velocity can be defined as the speed an object needs to achieve to break free of a gravitational force acting upon it. On Earth, an object needs to achieve a speed of about 6.5 miles per second to break free of Earth's gravity and not fall to the ground.

The Event Horizon

Black holes have a one-way surface called an event horizon. Objects can fall into the event horizon, but cannot come out. Interestingly, as an object moves closer and closer to the event horizon, its movement slows considerably, to the point that it will take an infinite time to reach it. This phenomenon is known as gravitational time dilation. A similar effect occurs between atomic clocks placed in different elevations. Eventually, the two clocks will begin to show slightly different times (in nanoseconds) because of the differences in gravitational potential of the two places.

Detecting a Black Hole

Although black holes are invisible, scientists can predict their existence based on events that occur near them, specifically a group of stars that appear to be orbiting a region of space that looks empty, or, extremely high levels of radiation (that can be measured from Earth) coming from the gas emitted by a companion star.

Types of Black Holes

Scientists have classified black holes into different types. A stellar black hole is formed from the gravitational collapse of a star. Supermassive black holes, found in the centers of galaxies, can be several billion times as massive as our sun. The hypothetical primordial black holes are thought to be smaller black holes that originated at the beginning of the Universe. A wormhole is a theoretical concept in which two black holes could be connected to each other. Some in the scientific community have used the model of a wormhole to suggest some amazing possibilities such as universe hopping (traveling quickly from one universe to another) and even a form of time travel.



Upgrade to MrN 365 to access our entire library of incredible educational resources and teacher tools in an ad-free environment. If you like MrNussbaum.com, you will LOVE MrN 365!

Learn More