What person is given credit for his pioneering work on breathing under hyperbaric conditions and the relationship to caisson disease

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

blue

light-years

magnitude