primarni

Stanice koje proizvodi apikalni meristem. Rast biljke koji nastaje proizvodnjom primarnog tkiva biljke u apikalnom meristemu na vrhovima izdanaka i korijena.

primarni proizvođač

Biology; Ecology

Organizam koji sam proizvodi svoju hranu fotosintezom (biljke) ili kemosintezom (neki mikroorganizmi). Primarni proizvođači čine temelj hranidbene mreže.

zimski solsticij

Astronomy; Mars

The position on the ecliptic occupied by the sun about december 22 when it reaches its greatest southerly declination.

proljetna ravnodnevica

Astronomy; Mars

The position on the celestial sphere occupied by the sun on or about march 21 when its path on the ecliptic crosses the celestial equator going from south to north. This point is ...

ultraljubičasto zračenje

Astronomy; Mars

The invisible electromagnetic radiation beyond the violet end of the spectrum of visible light, of wavelengths ranging, roughly, from 4000 down to 400 angstroms.

Mars

Astronomy; Mars

Mars is the fourth planet from the Sun. Mars' diameter is 6,790 km and takes 687 days to orbit the Sun. Mars is named after the Roman god of war. In Eastern Asian cultures Mars is ...

atmosfera

Astronomy; Mars

The gaseous envelope surrounding a celestial body.

astronomska jedinica (AJ)

Astronomy; Mars

A measure for distances within the solar system, equal to the mean ditance of the earth from the sun, which is about 93,000,000 miles.

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Industry/Domain: Aerospace Category: Space flight

svemirska letjelica

Svemirska letjelica s krilima, projektirana za djelomično višestruko korištenje, razvijena od strane NASA-e ( Zrakoplovna i svemirska administracija ...