Observing the Universe
Conditions d’achèvement
Consulter le glossaire à l’aide de cet index
Spécial | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Tout
A
Absorption spectrumA spectrum containing dark lines where specific wavelengths have been absorbed by a cooler gas. | |
Astronomical UnitThe average distance between the Earth and the Sun (about 150 million kilometres). | |