x-zrak

Gamma rays are like the light we see with our eyes, the x-rays used to probe our bodies in search of problems, and the radio waves that our television sets translate into inane ...

alfa-zrak

化学; 化学全般

A stream of alpha particles . Alpha rays rapidly dissipate their energy as they pass through materials, and are far less penetrating than beta particles and gamma rays .

reflektovani zrak

物理; 物理学全般

A line representing direction of motion of light reflected from a boundary.

neidentifikovani leteći objekat (NLO)

航空宇宙; 宇宙飛行

UFOs are unidentified aircraft which are attributed to alien space flight. One supposed UFO halted air traffic at Hangzhou Airport, China, on July 7. The appearance is being ...

svemirski šatl

航空宇宙; 宇宙飛行

A reusable spacecraft with wings developed by the U.S. National Aeronautics and Space Administration (NASA) for human spaceflight missions. The first test flight took place in ...

zenit

航空宇宙; 宇宙飛行

The point on the celestial sphere directly above the observer. Opposite the nadir.

x-dijapazon

航空宇宙; 宇宙飛行

A range of microwave radio frequencies in the neighborhood of 8 to 12 ghz.

težina

航空宇宙; 宇宙飛行

The gravitational force exerted on an object of a certain mass. The weight of mass m is mg Newtons, where g is the local acceleration due to a body's gravity.