Page 21 - Universe dictionary by Futura-Sciences

Alphabetical index

Partial eclipse A partial eclipse occurs when the Moon does not hide the Sun ...	Pegasus Pegasus is a launcher that differs from its competitors. It ...
Penumbra A region of space in which a body partly hides the Sun.	Perigee The perigee is the point in the orbit of a celestial body or ...
Perihelion The perihelion is the point in the orbit of a planet that is ...	Perturbed elliptic motion Perturbed elliptic motion is motion close to Keplerian ...
PFS The PFS (Planetary Fourier Spectrometer) is a scientific ...	Phase angle A phase angle is a fundamental quantity when observing the ...
Phases of the Moon The successive appearances of the Moon occurring when the ...	Phobos Satellite of Mars. Phobos looks a lot like an asteroid: It ...
Phobos-Grunt Phobos-Grunt was a Russian mission consisting in sending a ...	Phoenix Mars Lander Launched on 4 August 2007 by a Delta II rocket from Cape ...
Photoelectric A material is photoelectric if it emits electrons when it is ...	Photosphere The photosphere is the visible surface of a star (optical ...
Pink moon A so-called pink moon at beginning of spring is sometimes ...	Planck satellite The Planck satellite was launched in July 2008 by the Ariane ...
Planet The International Astronomical Union (IAU) deliberated ...	Planetary aberration A planetary aberration is an apparent shift in the observed ...
Planetary nebula A planetary nebula is an envelope of expanding gas around a ...	Planetocentric coordinates Planetocentric coordinates are coordinates used to locate a ...