Submitted by admin on Mon, 04/21/2014 - 21:56
definition:
A natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
sentence:
The Hubble Space Telescope has spotted auroras near the poles of both Saturn and Jupiter.
difficulty:
medium
toefl frequency:
2
toefl classification: