Asteroids - Deepstash

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Asteroids - Facts and Information about Asteroids | Space

Asteroids

Asteroids
  • Asteroids are rocks which revolve around the sun. They are usually too small to be considered as a planet since they can be as small as 2 meters but they can be as big as 940 kilometers across.
  • Asteroids are also known as planetoids or minor planets. They are often irregularly shaped but some tend to be almost spherically-shaped. They have pitted surfaces and are covered in dust.
  • They can be dangerous because many have hit Earth in the past and it's likely that it can happen again.

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My Red Is Your Blue
My Red Is Your Blue

About 1 per cent of American men suffer from red-green colour blindness.

Recent experiments challenge the accepted notion that all of us have the same default perception o...

The Calculations Of Light
  • The colour-sensitive receptors that humans have, called melanopsin, measure the amount of blue or yellow light in the atmosphere and likewise regulate our circadian rhythm.
  • Human beings have Cone Cells, which are of three types, Red, Blue, and Green, and have evolved much later than the receptors in the brain.
Colour Is A Private Sensation
  • Research proves that the universal emotional responses that we have when we see a colour tend to be the same, even if the actual colour is different, as our conscious perception of those colours varies.
  • The day-night cycle of living things is impacted by the ambient light, where the morning yellow light awakens us or makes us feel happy, and the dominance of blue light at night makes us feel sleepy.
The history of refrigeration
The history of refrigeration

Refrigeration is the action of creating cooling conditions by removing heat. It is used for preserving food by slowing bacteria growth.

  • Around 1000BC, the Chinese u...
Evaporative cooling
  • 1720s. Scottish doctor William Cullen saw that evaporation had a cooling effect.
  • 1748. Cullen demonstrated his ideas by evaporating ethyl ether in a vacuum.
  • 1805. Oliver Evans designed a refrigeration machine that used vapor instead of liquid.
  • 1820. English scientist Micahel Faraday used liquefied ammonia for cooling.
  • 1835. Jacob Perkins, who worked with Evans, patented a vapor-compression cycle using liquid ammonia.
  • 1842. John Gorrie, an American doctor, built a machine similar to Evans's design to artificially create ice and cool down patients with yellow fever.
  • New and improved refrigeration ideas continued to be developed, including Albert Einstein's idea of an environmentally friendly refrigerator with no moving parts that did not rely on electricity.
  • By 1920, refrigerators were considered essential in American homes.
How refrigerators work

Refrigerators today work by evaporating liquids.

The liquids are pushed through the refrigerator through tubes and begin to vaporize. As the liquids evaporate, they carry heat away with them as the gases travel to a coil outside the refrigerator. Here the heat is released. The gases return to a compressor, where they become liquid again, restarting the cycle.

Contagious yawning
Contagious yawning

Whenever someone yawns near you, you may find it near impossible not to yawn.

New studies found the reason we battle to stop a yawn appears to reside in the brain area that's responsibl...

Yawning and brain activity

The urge to yawn increases when you try to stop yourself from doing so.

The tendency to yawn in return is linked to brain activity levels in a person's motor cortex. The more activity in the area, the more likely the person would be to yawn.