Ten parsecs is about ________.
A) 32.6 light-years B) 10 parallax seconds of angle
C) 150 million kilometers D) 10,000 seconds
Question 2
What lucky factor prevented the Chelyabinsk object from causing much damage at ground level?
A) It was made entirely of ices and thus exploded high in the air.
B) It hit Earth at an oblique angle and thus exploded high in the air.
C) A prototype asteroid defense system was being tested nearby.