Physical Science

Atoms are about as small as anything gets, at least in any terms the average person can comprehend. Any smaller, and you’re looking at a particle that no longer retains any of its chemical properties: You can’t have, for instance,…
Read more

The metalloid Boron (B) is a versatile and useful element that has found many different uses in domestic and industrial processes in more advanced cultures. Physical characteristics: Atomic number – 5Atomic mass – 10.811Atomic group IIIAOxidation state – +3Isotopic states…
Read more

Samarium Symbol: Sm Atomic Number: 62 Atomic Mass: 150.36 amu (atomic mass units) Melting Point: 1072.0°C (1345.15 K, 1961.6°F) Boiling Point: 1900.0°C (2173.15 K, 3452.0°F) Number of Protons: 62 Number of Electrons: 62 Number of Neutrons: 88 Classification: Rare Earth…
Read more

Skywatcher is a company I use regularly, their products seem to be of a consistent quality. As such I’ve come to assosciate them with reliability so I expected the LER to be a quality eyepiece despite it’s meager price tag of just…
Read more

The Celestron Omni 6mm is a Plossl design. Traditionally Plossl eyepieces contain 4 or 5 lenses. The Omni 6mm is typical in this regard and contains 4 lenses. The lenses are arranged in a symmetrical fashion, being 2 goups of…
Read more

The Plossl class of eyepiece is saturated with offerings from all different companies and all different shapes and sizes. Any Plossl will do the job but if you are willing to spend a little extra you can own a Televue…
Read more

The semi-metal element Boron, with atomic number 5, occurs in group 13 and period 2 of the periodic table. It is solid at room temperature and melts at 2348 K (2075 C, 3767 F) then boils at 4273 K (4000…
Read more

Praseodymium Chemical Symbol: Pr Atomic Number: 59 Atomic Mass: 140.90765 amu (atomic mass units) Melting Point: 935.0 C (1208.15 K, 1715.0 F) Boiling Point: 3127.0 C (3400.15 K, 5660.6 F) Number of Protons/Electrons: 59 Number of Neutrons: 82 Classification: Rare…
Read more

Cobalt Symbol: Co Atomic Number: 27 Atomic Mass: 58.9332 amu (atomic mass units) Melting Point: 1495.0 C (1768.15 K, 2723.0 F) Boiling Point: 2870.0 C (3143.15 K, 5198.0 F) Number of Protons: 27 Number of Electrons: 27 Number of Neutrons:…
Read more

Boron was named from borax, the mineral that contains boron in large quantities. It is a component of the gemstone tourmalines. It was discovered by the French chemists Joseph-Louis Gay-Lussac and Louis-Jaques Thnard in 1808, the same year that it…
Read more