Narrator: As the solar system grew, four rocky planets: Mercury, Venus, Earth and Mars, were created closest to the Sun. Made of rocks and metals, they have solid surfaces and a central core of ...

Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

Four bright planets are conveniently placed for viewing ... Mercury is a -0.2-magnitude "morning star" rising 1.5 hours before the sun. In mid-twilight on the 1st, look 12 degrees to the lower ...

A "domino effect" may occur in star systems whereby newly formed planets close to a star help ... [+] shepherd dust and gas to create more planets farther out in the system. Astronomers using a ...