Scientists in the United States have found a planet similar to Earth outside the solar system.
The planet is not only about the same size as Earth but has the same proportions of iron and rock, a key step in an ongoing quest to find potentially habitable sister worlds.
The planet, known as Kepler-78b, circles a star that is slightly smaller than the sun located in the constellation Cygnus, about 400 light years away.
The planet is not only about the same size as Earth but has the same proportions of iron and rock, a key step in an ongoing quest to find potentially habitable sister worlds.
The planet, known as Kepler-78b, circles a star that is slightly smaller than the sun located in the constellation Cygnus, about 400 light years away.