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Prototype of a small group of asteroids whose orbits intersect that of Earth.
Industry:Astronomy
One of a small group of asteroids whose orbits intersect that of Earth. They are named for the prototype, Apollo.
Industry:Astronomy
Successful US lunar exploration program in which the Apollo spacecraft 1 to 6 were unmanned; 7 to 10 were manned but did not land; and 11, 12 and 14 to 17 landed and returned safely. (Apollo 13 was an aborted mission.) The first men to land on the Moon were Neil Armstrong and Edwin Aldrin, from Apollo 11, on 20 July 1969. The final Apollo flight (17) lasted from 7 to 19 December 1972, and left a considerable quantity of exploratory devices on the lunar surface.
Industry:Astronomy
Physics as promulgated by Aristotle; includes the hypothesis that our world is comprised of four elements, and that the universe beyond the moon is made of a fifth element and so is fundamentally different from the mundane realm.
Industry:Astronomy
The number of atoms in 12 grams of carbon 12. The number of atoms in a gram-atom (mass in grams numerically equal to the atomic weight) or the number of molecules in a gram-molecule (mass in grams numerically equal to the molecular weight.)
Industry:Astronomy
The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.
Industry:Astronomy
Varijabilna zvezda sa neregularnim varijacijama. Pošto se kreče iz pravca koji direktno vodi natrag ka Velikoj maglini u Orionu smatra se da je napustila ovu grupu pre oko 2,7 miliona godina
Industry:Astronomy
A K5 III subgiant (a foreground star in the Hyades). It has a faint M2 V companion. It is now known to be slowly and irregularly variable.
Industry:Astronomy
