Mars as a Member of the Solar System: One of a System of NASA Facts about the Exploration of Mars |
Common terms and phrases
106 km Aphelion appear to move arrival at Mars astronomical August axial axis CANCER close opposition compared with Earth's conjunction dated positions DAYLIGHT December 15 Deimos and Phobos difficult to observe Earth and Mars Earth moves Earth's orbit Earth's sky ecliptic fast car Figure GEMINI hemisphere summer hemisphere winters hours inner satellite July kilometers launch and arrival line Mariner 9 Photo Martian surface Mercury midnight sky minutes month Moon Motions of Mars movement of Mars night sky north and south northern hemisphere November ORBIT OF EARTH orbit of Mars ORION PATH OF MARS perihelion planet polar cap positions of Mars PROCYON Project QUADRATURE radio signals RETROGRADE LOOP revolve right ascension Satellites of Mars seasons seen from Earth shadow SIRIUS slow car Solar southern sky spacecraft stars surface of Mars TAURUS MARS telescope tilt tiny varies considerably Venus viewed from Earth Viking launch Virgo Zodiacal constellations