Our Solar family (i)______________ continuously. Seventy four years after Pluto was
discovered, scientists (ii)____________________ a planetoid, Sedna, which is the most
distant object ever detected orbiting the sun. Space telescope Spitzer’s piercing infrared rays
have made the (iii) ______________ possible. Otherwise Sedna (iv) ______________
shrouded in the mysterious vastness of space. Moreover, Sedna is bigger than Pluto.
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1 part of our solar system
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