1. The Blackest Black
The world’s blackest black material, created by scientists at the Massachusetts Institute of Technology, absorbs 99.965% of visible light, making it appear almost completely black to the human eye.
2. Black Holes
Black holes are regions of spacetime where gravity is so strong that nothing, not even light, can escape. The mass of a black hole is concentrated at a single point called the singularity, which is infinitely dense and hot.
3. Vantablack
Vantablack is a carbon nanotube coating developed by the British company Surrey NanoSystems. It is one of the blackest materials ever created, absorbing over 99.995% of light that strikes it.
4. Blackbody Radiation
Blackbody radiation is electromagnetic radiation emitted by a black body, which is an object that absorbs all incoming radiation and emits radiation only due to its own temperature. The blackbody spectrum is a continuous spectrum with a peak wavelength that is inversely proportional to the temperature of the black body.
5. Black Carbon
Black carbon is a type of particulate matter emitted by diesel engines and other combustion processes. It is a major contributor to climate change and air pollution.
6. Black Market
The black market is an illegal trade in goods and services that are not offered through legitimate channels. The black market often involves counterfeit goods, illegal drugs, and weapons.
7. Black Widow
The black widow spider is a poisonous spider that is found in many parts of the world. The female black widow is known for its distinctive black body with a red hourglass marking on its abdomen.
8. Black Sea
The Black Sea is a marginal sea of the Atlantic Ocean that is located between Europe and Asia. It is the world’s largest enclosed body of water.
9. Black Death
The Black Death was a bubonic plague pandemic that ravaged Europe in the 14th century. It is estimated to have killed between 30% and 60% of the European population.
10. Black Flag
The black flag is a symbol of anarchy and rebellion. It is often used by anarchist groups and protesters.
11. Black Lives Matter
Black Lives Matter is a social movement that fights against police brutality and racial injustice against Black people.
12. Black Panther
The black panther is a large cat that is found in Africa and Asia. It is known for its black fur and solitary nature.
13. Black Death
The Black Death, also known as the bubonic plague, is a deadly infectious disease caused by the bacterium Yersinia pestis. It is transmitted to humans by fleas that have bitten infected rodents. The Black Death has killed an estimated 200 million people throughout history.
14. Black Hole
A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape. Black holes are formed when massive stars collapse at the end of their lives.
15. Black Hole Information Paradox
The black hole information paradox is a theoretical problem in physics that arises from the combination of quantum mechanics and general relativity. The paradox arises because quantum mechanics predicts that information cannot be destroyed, while general relativity predicts that information can be destroyed in a black hole.
16. Black Hole Merger
A black hole merger is a gravitational event that occurs when two black holes collide and merge together to form a single, larger black hole. Black hole mergers release a tremendous amount of energy in the form of gravitational waves.
17. Black Market
The black market is an illegal marketplace where goods and services are traded outside of government regulations. The black market often involves the sale of illegal drugs, weapons, and counterfeit goods.
18. Black Mirror
Black Mirror is a British television series that explores the potential negative impacts of new technologies. The series has been praised for its dark and thought-provoking episodes.
19. Black Panther
Black Panther is a Marvel Comics superhero who is the king of the fictional African nation of Wakanda. Black Panther is known for his advanced technology and his commitment to justice.
20. Black Power Movement
The Black Power Movement was a social and political movement that emerged in the United States in the 1960s. The movement advocated for self-determination, self-defense, and economic empowerment for Black people.
Table 1: Black Holes
| Property | Value |
|---|---|
| Mass | >3 solar masses |
| Radius | <3 Schwarzschild radii |
| Density | >10^9 g/cm^3 |
| Temperature | <10^-6 K |
| Event horizon | Surface from which nothing can escape |
| Singularity | Point of infinite density and gravity at the center of a black hole |
Table 2: Black Market
| Product/Service | Value |
|---|---|
| Drugs | $500 billion per year |
| Weapons | $1 trillion per year |
| Counterfeit goods | $2 trillion per year |
| Human trafficking | $150 billion per year |
| Wildlife trafficking | $23 billion per year |
Table 3: Black Deaths
| Type | Number of deaths |
|---|---|
| Plague of Justinian (541-542 AD) | 100 million |
| Black Death (1347-1351 AD) | 25-30 million |
| Great Plague of London (1665-1666 AD) | 100,000 |
| Plague of Marseille (1720 AD) | 50,000 |
| Plague of 1894 | 10,000 |
Table 4: Black Hole Mergers
| Event | Date | Location |
|---|---|---|
| GW150914 | September 14, 2015 | LIGO Hanford Observatory and LIGO Livingston Observatory |
| GW151226 | December 26, 2015 | LIGO Hanford Observatory and LIGO Livingston Observatory |
| GW170104 | January 4, 2017 | LIGO Hanford Observatory and LIGO Livingston Observatory |
| GW170814 | August 14, 2017 | LIGO Hanford Observatory and LIGO Livingston Observatory |
| GW170817 | August 17, 2017 | LIGO Hanford Observatory and LIGO Livingston Observatory |
Common Mistakes to Avoid
When it comes to black holes, there are a few common mistakes to avoid.
- Assuming that black holes are completely black. Black holes are not completely black. They emit a faint glow called Hawking radiation.
- Thinking that nothing can escape from a black hole. While nothing can escape from a black hole’s event horizon, information can escape from a black hole’s interior.
- Believing that black holes are the same as wormholes. Black holes are not the same as wormholes. Wormholes are hypothetical tunnels through spacetime that could connect two different points in the universe.
How to Step-by-Step Approach
If you are interested in learning more about black holes, there are a few things you can do.
- Start with the basics. Before you can understand black holes, you need to understand the basics of physics, including gravity, spacetime, and quantum mechanics.
- Read books and articles about black holes. There are many excellent books and articles about black holes available online and in libraries.
- Attend lectures and presentations about black holes. Many universities and science museums offer lectures and presentations about black holes.
- **Visit