- Отрасли: Astronomy
- Number of terms: 6727
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Planetary Science Research Discoveries (PSRD) is an educational site sharing the latest research by NASA-sponsored scientists on meteorites, asteroids, planets, moons, and other materials in our Solar System. The website is supported by the Cosmochemistry Program of NASA's Science Mission ...
Mass per unit volume; a measure of how much material is in a given space.
Industry:Astronomy
A constant value: 299,792,458 meters per second (186,282 miles per second).
Industry:Astronomy
Unit of measure that is one-billionth of a meter. A nanometer-sized particle is smaller than a living cell and can only be seen with the most powerful microscopes.
Industry:Astronomy
Extremely high-energy subatomic particles that continuously bombard Earth from all directions. Most cosmic rays hit and break up atomic nuclei in Earth's upper atmosphere. Airless bodies are not protected and their surfaces (asteroids, for example) are exposed.
Industry:Astronomy
The part of Earth's crust, water, and atmosphere where living organisms can survive.
Industry:Astronomy
Variable radio star having stable, very short (around one second) periods of pulsations. Electrons moving rapidly in a pulsar's magnetic field produce narrow beams of radiation which sweep around as the pulsar spins (analogous to sweeping search-light beams).
Industry:Astronomy
The fourth state of matter beyond solid, liquid, and gas. Plasma may be the most common state of matter in the universe. Our Sun is plasma. In space science, plasma is hot, ionized gas--a mixture of electrons (negative electric charge) and protons (positive electric charge). Plasma conducts electrical currents and responds to electromagnetic fields.
Industry:Astronomy
Премахване на изветрели скали от движеща се вода, вятър, лед или тежестта.
Industry:Astronomy
