 The <unk> Space Telescope measured the planet temperature , and found that the difference between the two sides of <unk> <unk> b of about 1 @,@ 400 degrees <unk> , ranging from minus 20 to 230 degrees to about 1 @,@ 400 to 1 @,@ 650 degrees <unk> . The temperature difference has led to speculation that <unk> <unk> b is <unk> locked with the same side always facing <unk> <unk> A. 
