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【单选题】Scientists said they have found evidence of a giant planet far out in our solar system.In a statement, the California Institute of Technology—Caltech—said this planet travels a very strange “longandth...
A.
mathematicalmodeling
B.
computer simulations
C.
advanced telescopes
D.
large spacecrafts
【单选题】Scientists said they have found evidence of a giant planet far out in our solar system.In a statement, the California Institute of Technology—Caltech—said this planet travels a very strange “longandth...
A.
there is no actual confirmation about the ninthplanet
B.
no true planets were discovered in ancient times
C.
scientists have found three planets in modern times
D.
the ninth planet is the only one discovered since ancient times
【单选题】Scientists said they have found evidence of a giant planet far out in our solar system.In a statement, the California Institute of Technology—Caltech—said this planet travels a very strange “longandth...
A.
moves around the Sun
B.
was discovered by two astronomers
C.
travels a round orbit
D.
is far away from our solar system