<Tr> <Td> 7018293282644650004 ♠ 310 × 10 ly </Td> <Td> Canopus, second in brightness in the terrestrial sky only to Sirius, a type F supergiant 7004150000000000000 ♠ 15 000 times more luminous than the Sun . </Td> </Tr> <Tr> <Td> 10 </Td> <Td> 7019283821914177424 ♠ 3 × 10 ly </Td> <Td> A0620 - 00, the nearest known black hole, is about 7003300000000000000 ♠ 3000 light - years away . </Td> </Tr> <Tr> <Td> 7020245978992287100 ♠ 26 × 10 ly </Td> <Td> The centre of the Milky Way is about 7004260000000000000 ♠ 26 000 light - years away . </Td> </Tr> <Tr> <Td> 7020946073047258079 ♠ 100 × 10 ly </Td> <Td> The Milky Way is about 7005100000000000000 ♠ 100 000 light - years across . </Td> </Tr>

How fast does light travel in a vacuum in a julian year