Chapter 1 Flashcards
1
Q
extrasolar planets
A
planets orbiting stars other than our Sun
2
Q
habitable worlds
A
worlds that contain the basic necessities for life (nutrient source, energy, liquid water)
3
Q
how to remember the order of the planets
A
my very educated mother just served us nine pizzas
4
Q
astrobiology
A
the study of life in terms of space
5
Q
watering hole
A
region over which SETI tends to search; something about H and OH?
6
Q
necessities for life
A
nutrient source, energy (sunlight, chemical reactions, internal heat), liquid water (or possible other liquid)
7
Q
celestial sphere
A
the imaginary sphere on which objects in the sky appear to reside when observed from earth
8
Q
ecliptic
A
the sun’s annual apparent annual path among the constellations
9
Q
earth’s tilt
A
23.5 degrees
