policickicni aromaticni ugljovodonik

A chemical compound that contains a carbon backbone with hydrogen atoms attached to that backbone. What we refer to as petroleum is actually liquid, geologically extracted ...

ugljovodonik

化学; 有機化学

One of a very large group of chemical compounds composed only of carbon and hydrogen; the largest source of hydrocarbons is from petroleum crude oil.

Ceres

天文学; 惑星科学

The largest of the known asteroids; a dwarf planet. Also called 1 Ceres because it was the first asteroid to be discovered (by Piazzi in 1801).

Jarkovski efekat

天文学; 惑星科学

An explanation for the shift in an asteroid's orbit around the Sun due to a thermal thrust caused by the body's uneven heating by sunlight. The illuminated side of an asteroid ...

Viking

天文学; 惑星科学

U. S. Mission to Mars, composed of two spacecraft, launched in 1975. Viking 1 and Viking 2 both consisted of an orbiter and a lander. Primary mission objectives were to obtain ...

sublimacija

天文学; 惑星科学

Phase transformation from solid to gas.

Misija Stardust

天文学; 惑星科学

The fourth in NASA's Discovery program of low-cost spacecraft with highly focused science goals, Stardust was comprised of a spacecraft and capsule that completed a seven-year, ...

Solarna i heliosfericna observatorija

天文学; 惑星科学

A project of international collaboration between ESA and NASA to study the Sun from its deep core to the outer corona and the solar wind. SOHO was launched in December, 1995. SOHO ...