Question

Which planet is the brother os Earth​

Answer 1

Introducing Earth's bigger, older brother: planet Kapteyn b (w/ Video) We now know of a potentially habitable planet five times the size of Earth that has existed for more than twice as long.

Answer 2

$\huge{\fbox{\fbox{\purple{planet \: Kapteyn \: b}}}}$

Introducing Earth's bigger, older brother: planet Kapteyn b (w/ Video) We now know of a potentially habitable planet five times the size of Earth that has existed for more than twice as long.