Probablility of detecting extrasolar civilizations
By: D. Vogt
It is impossible to actually calculate the probability of detecting extrasolar civilizations, simply because too many of the variables involved are unknown. However, there are some general guidelines which can help us explain why, at the very least, detecting extrasolar civilizations has so far proved...
The Apollo 1 crew
By: D. Vogt
There is no such thing as a safe space flight: launching atop what amounts to an enormous, barely controlled explosion; flying through the near-vacuum of Earth orbit; and then plunging back to the surface with only a perilously fragile heat shield for protection. Eighteen American...
Explaining how crystals form
By: Minute Major
The significance of crystals in chemistry is often overlooked. Working in an organic chemistry lab, scientists often use the process of crystallization to purify a specific compound. Crystals are often formed in nature, under similar circumstances. Crystallization occurs when a starting material, usually a powder...
NASA's STEREO mission's role in studying coronal mass ejections on the Sun
By: D. Vogt
NASA's STEREO mission is a solar probe mission studying coronal mass ejections. The name, Solar Terrestrial Relations Observatory (STEREO), is a contrived acronym, referring to the fact that the mission is actually being carried out by two spacecraft, one leading the Earth in its orbit...
The Clarke Belt: Geostationary orbits above the earth
By: D. Vogt
The term Clarke Belt is an alternative and now little-used term to refer to the range of geostationary and near-geostationary orbital bands lying above the Earth's equator, in which a satellite can circle the Earth while remaining more or less directly above the same physical...
By: D. Vogt
Determining the number of stars in the sky is actually a surprisingly difficult problem, because it leads directly into a second problem: determining the size of the universe. The European Space Agency says there are between 10 sextillion and one septillion stars in the universe...
Examples of mixtures found around the house
By: Ernest Capraro
Mixtures are all around us. Remember, a mixture is anything other than a pure substance, and very few things are entirely pure substances. Walking around the house and yard, a myriad of example are instantly available. For the sake of a little organization, these examples...
The history of NASA's Gemini Program
By: D. Vogt
Project Gemini was NASA's second major series of manned spacecraft, the intermediate stage between the groundbreaking Project Mercury, which placed the first American astronauts into space, and the Apollo project, which sent astronauts to the Moon for the first - and, so far, only -...
What led to John Dalton's atomic theory?
By: Minute Major
Modern chemistry recognizes many compounds and mixtures that result from the bonding of atoms. This basic idea is the heart around which all chemistry is structured. However, it wasn’t until the late 1700’s that these important building blocks of chemistry were discovered. Antoine...
How many feet in a metric meter
By: Bennett Kalafut
• The Standard or International Foot • All of the old British Imperial/US Customary units are now defined strictly in terms of SI ("metric") units. In the USA, NIST (National Institute of Standards and Technology, formerly the National Bureau of Standards), an agency of the...

 

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