Physical Science

Manganese (Mn) is the 25th chemical element on the periodic table – that is, its atoms have 25 protons in their nucleus. A naturally occurring metal, manganese is often used in industrial alloy processing and as a rust prevention tool….
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The Swedish chemist Johan Gottlieb Gahn discovered the hard but brittle metallic element manganese (symbol Mn) in 1774. However, another Swedish chemist, Carl Wilhelm Scheele, proposed the existence of such an element prior to its discovery. Gahn isolated the element…
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Manganese Symbol: Mn Atomic Number: 25 Atomic Mass: 54.93805 amu (atomic mass units) Melting Point: 1245.0 C (1518.15 K, 2273.0 F) Boiling Point: 1962.0 C (2235.15 K, 3563.6 F) Number of Protons: 25 Number of Electrons: 25 Number of Neutrons:…
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Originally, the rotation rate of a planet was measured by tracking visual features believed to be on the surface of the planet. This is still the case today for nearby rocky planets with solid surfaces and distinct landforms visible from…
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The Swedish chemist Johan Gottlieb Gahn discovered the element manganese (symbol Mn, atomic number 25), a gray-white, hard, brittle metallic element, in 1774. Its relationship with man and most other life on Earth has a long history, as it is…
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Asteroids are similar to planets, but they are much smaller and can be irregular in shape.  Most of them are between Mars and Jupiter, but some come so close to the Earth that they are watched in case an impact…
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Near-Earth asteroids, generally defined as asteroids with orbits that bring them within just tens of millions of miles of planet Earth, are one of the most important subjects of space research today. Charting the orbits of near-Earth asteroids is important…
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Along with the many other natural objects traveling through the solar system with planet Earth, asteroids and meteorites share some new notoriety due to their numbers and an increased focus by the National Aeronautics and Space Administration (NASA).  Described bluntly,…
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The “dog days of summer” is an aphorism that is often used to describe the hottest period of the summer season (in the northern hemisphere, July-early August; in the southern hemisphere, January-early February). In modern times the saying is believed…
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Although the long, hot and muggy days of August might serve up weather that is not “fit for a dog”, the phrase “Dog Days of Summer” have nothing to do with your pet’s health or comfort. So where did this…
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