The lunar maria are ancient _______________ that have apparently covered older, cratered lowlands.
Fill in the blank(s) with correct word
Question 2
The Algol paradox is concerned with ____.
a. the difference between spherical and lobed appearance of planetary nebulae
b. production of heavy elements in supernova events
c. stars in close binaries that are lower mass, but more evolved, than their companion
d. the cooling of matter falling into a compact object in an accretion disk
e. the change in stellar winds from normal to superwind conditions
Common Wombat, Maria Island, Tasmania
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