Stellar spectral classification utilizes seven main classes (O, B, A, F, G, K, M), ordered by decreasing surface temperature, with each class further subdivided into numerical subclasses (0-9) ...
10monon MSN
Colour-coding at each step
When 29-year-old Chandigarh resident Vishali Kanojia steps outside her house, she lets the first colour she sees guide her ...
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