What is Volcanic Ash?

Small jagged pieces of rocks, minerals, and volcanic glass the size of sand and silt (less than 1/12 inch or 2 millimeters in diameter) erupted by a volcano are called volcanic ash. Very small ash particles can be less than 1/25,000th of an inch (0.001 millimeter) across. Though called 'ash,' volcanic ash is not the product of combustion, like the ...

Geology

Will Runaway Water Warm the World?

Water in the upper atmosphere will make the Earth heat up, but not as much as many scientists have believed, says a new study published by NASA scientists. Using satellite data, researchers Ken ... Continue reading

Astronomy

Live Fast, Blow Hard, and Die Young

Massive stars lead short, yet spectacular lives. And, they usually do not go quietly, instead often blowing themselves apart in supernova explosions. Astronomers are curious about the details of the ... Continue reading

Astronomy

What is Dark Energy?

Because he originally thought the Universe was static, Einstein conjectured that even the emptiest possible space, devoid of matter and radiation, might still have a dark energy, which he called a ... Continue reading

Geology

Antarctica and Climate Change

Because of its influence on world weather and climate patterns, Antarctica lies at the heart of the debate on climate change and has become the premier location in which to study the effects of global ... Continue reading

How Fast is Mach 1?

by Anton Skorucak, MS

Mach1 A Mach number is a common ratio unit of speed when one is talking about aircrafts. By definition, the Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling.

It is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air (which is 332 m/s or 1195 km/hr or 717 miles/hour.) An aircraft flying at Mach 2 is flying at twice the speed of sound in air, etc. Mach numbers are named after Ernst Mach (1838-1916), an Austrian philosopher and physicist. The term Mach number came into use in 1929.

What is Volcanic Ash?

Will Runaway Water Warm the World?

Live Fast, Blow Hard, and Die Young

What is Dark Energy?

Antarctica and Climate Change

How Fast is Mach 1?

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