Astrophysics and Cosmology
Requisitos de finalización
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Especial | A | B | C | D | E | F | G | H | I | J | K | L | M | N | Ñ | O | P | Q | R | S | T | U | V | W | X | Y | Z | TODAS
P
ParsecAn astronomical distance equal to about 3.26 light-years. | |
Perihelionthe point in an orbit closest to the Sun. | |
Planetary defenceefforts to detect and potentially prevent dangerous asteroid or comet impacts. | |
Planetary massthe total mass of a planet. | |
Planetary NebulaA glowing shell of gas expelled by a dying Sun-like star. | |
Planetary radiusthe distance from the centre of a planet to its surface. | |
Polar orbitan orbit that passes over or near Earth's poles. | |
ProtostarA young forming star that has not yet begun nuclear fusion. | |
PulsarA rapidly rotating neutron star that emits beams of electromagnetic radiation. | |