<Tr> <Th_colspan="2"> Characteristics </Th> </Tr> <Tr> <Th> Spectral type </Th> <Td> G2V </Td> </Tr> <Tr> <Th> U − B colour index </Th> <Td> + 0.24 </Td> </Tr> <Tr> <Th> B − V colour index </Th> <Td> + 0.71 </Td> </Tr>

How many solar systems can fit between us and alpha centauri