Question

urjent will mark as brainlist the middle visible layer of the sun
the worlds first satellite name

Answer 1

chromosphere is the middle layer in the sun.

Worlds first satellite is sputnik.

Answer 2

layers of the sun
1)Photosphere - The photosphere is the deepest layer of the Sun that we can observe directly.
2)Chromosphere - The chromosphere is a layer in the Sun between about 250 miles (400 km) and 1300 miles (2100 km) above the solar surface (the photosphere).
3)Transition Region - The transition region is a very narrow (60 miles / 100 km) layer between the chromosphere and the corona 
4)Corona - The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere). 

world's first satellite

History changed on October 4, 1957, when the Soviet Union successfully launched Sputnik I. The world's firstartificial satellite was about the size of a beach ball.

#ninja