bginilah mengukur kesepatan cahaya..digunakan satuan tahun cahaya. - TopicsExpress

bginilah mengukur kesepatan cahaya..digunakan satuan tahun cahaya. Cahaya bergerak 300.000 km per detik maka 1 detik cahaya (light second) setara dengan jarak 300.000 km. Bagaimana kalau setahun?"300.000 km/detik x 60 detik/menit x 60 menit/jam x 24 jam/hari x 365,25 hari/tahun = 9.467.280.000.000 km = (9,46 x 1012) km."( 1 Astronom = 1 tahun perjalanan cahaya. Itu jarak (L)=Vc x t. Vc=kec. Cahaya; t=detik. Kec cahaya=300.000 km/det.)

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