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Two American soldiers pictured during the 2003 Iraq War seen through an image intensifier
Night vision is the ability to see in low-light conditions. Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range.

Venus- 225 days
Uranus orbit around the sun 84 years.
saturn orbit around the sun 29 years.
Neptune 165 years.

A white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer

Monoecious, an individual that has both male and female reproductive units (flowers, conifer cones, or functionally equivalent structures) on the same plant; from Greek for “one household”. Individuals bearing separate flowers of both sexes at the same time are called simultaneously or synchronously monoecious.

Inside a pressure cooker, once the water (liquid) is boiling and the steam is trapped, the pressure from the trapped steam increases and this pushes on the liquid, which increases its boiling temperature, because it becomes harder for the water molecules to escape from the surface as the pressure increases on it.

An uplink is that part of the communication link where signals from an earth terminal are sent to a satellite or some other type of airborne platform, hence the “up” portion of the term.

The term is commonly used in different areas of telecommunications such as cellular networks and computer network where the communication is coming from a lesser station up towards a larger portion of the network.

A normal human eye can see objects between 25cm and infinity.

The aurora (Northern Lights and Southern Lights) mostly occur in the thermosphere. The thermosphere is a layer of Earth’s atmosphere. The thermosphere is directly above the mesosphere and below the exosphere.

The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart.
Subclavian vein – These carry oxygenated blood up to the brain from the base of the neck.
The inferior vena cava (or IVC) is a large vein that carries the deoxygenated blood from the lower and middle body into the right atrium of the heart.
Superior Venecava is the great venous trunks that return deoxygenated blood from the systemic circulation to the right atrium of the heart.

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

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