Browse "Physics"

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Ozone Depletion

Ozone depletion is a chemical thinning of the OZONE LAYER in the stratosphere or upper atmosphere. Scientists determined in the 1970s that it is caused by ozone depleting substances (ODSs), particularly by the use of chlorofluorocarbons (CFCs).

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St Elmo's Fire

St Elmo's Fire is a blue or reddish glow, sometimes with the appearance of a flame, accompanying a powerful electrical discharge from a pointed conducting object in an intense electric field.

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Exploring Mars

Driver required to operate robotic rover from 190 million kilometres away. Must be able to negotiate vehicle across rock-strewn martian terrain using commands that take 11 minutes to arrive. Experience with computer games an asset.

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Polar Lander Fails on Mars

No one knows exactly what the surface of Mars is like, but Robert Zubrin has a pretty good idea. At least some of it, he says, is much like a frozen, god-forsaken corner of the Canadian Arctic called Haughton Crater. The terrain is similar - rough-strewn rock on the floor of a crater 16 km across.

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Nuclear Fusion

Nuclear fusion is the combination of the nuclei of two light atoms to form a heavier one. The resulting atom has a smaller mass than the original ones; therefore, nuclear fusion is a method of transforming mass into energy.

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Galaxy

Serious attempts to estimate the size of the galaxy began in the 19th century.

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Gravity

Gravity, the fundamental physical property of attraction between all bodies, is here considered mainly as it relates to the study of the Earth.

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Life on Mars?

It was an evening in summer upon the placid and temperate planet Mars. Up and down green wine canals, boats as delicate as bronze flowers drifted ....

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Lightning

As a thunderstorm grows, or a mature storm approaches, this electric field is reversed. In general, the lower part of a cloud is negatively charged; the upper portions, positively charged. A further positive charge is induced on the Earth's surface below a thunderstorm.

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Magnetic Poles

The north and south magnetic poles are the locations on Earth's surface where the planet's magnetic field points straight downwards (at the north magnetic pole) and upwards (at the south magnetic pole). Conventional compasses which move on a horizontal plane are useless near the magnetic poles.

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Meteorology

Physical meteorology links meteorology and physics in studies of 3 core topics: electromagnetic radiation, meteorological thermodynamics and cloud physics. Related topics include stratospheric physics, atmospheric electricity, optics and ACOUSTICS.

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Montréal Planetarium

​Montréal’s Rio Tinto Alcan Planetarium is part of the Space for Life complex, which includes Montréal’s Biodome, Insectarium and Botanical Gardens. Space for Life is the largest natural science museum complex in Canada.

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Moon

The dark grey lunar surface reflects only 7% of the sunlight it receives (comparable to the reflectivity of black soil). The moon is dominated by thousands of craters, ranging from microscopic pits to gigantic Clavius, diameter 230 km.

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Neutrino Project

Most people would no doubt balk at having to stand on the roof of an elevator as it drops slowly into a dark mine shaft sunk more than a mile into the ground. Not physicist Duncan Hepburn, 53, who shrugs off the task as just another part of his job. Some job.

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Noise

Noise denotes unwanted or unmusical sounds, especially those that are random or irregular. The attitude that noise is not conducive to the well-being of sentient creatures is as old as history.

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Observatory

Of the observatories in use before the invention of the telescope, perhaps the most scientifically productive was that of Tycho Brahe, built 400 years ago on the island of Hveen in the Baltic Sea.

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Physics

Physics is the study of matter and radiation, the space-time continuum that contains them, and the forces to which they are subject.