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10	"Mercury" Mercury: Practically no atmosphere! Venus: 96.5% Carbon dioxide (CO₂); 3.5% Nitrogen (N₂) Earth: 78% Nitrogen (N₂); 21% Oxygen (O₂) Mars: 95.3% Carbon dioxide (CO₂); 2.7% Nitrogen (N₂); 1.6% Argon (Ar) Titan: 90% Nitrogen (N₂); 6% Argon (Ar) Pluto: Methane (CH₄); Nitrogen (N₂)
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56	What was known about Titan wind? Voyager observations of thermal balance Occultation of star 28 Sgr
57	Doppler shift affects light as well as sound.
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84	Since 1995, more than 200 extrasolar planets have been discovered - most by radial velocity (indirect detection)
85	Transiting Planet Science
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