It would most likely be from another planet of the solar system.

Seventh planet of the solar system, warmed by internal heat.

The School comprises four houses named after the various planets of the solar system.

Since the universe is expanding, the distance between Earth and the other planets of the solar system will eventually increase.

One theory is that comets formed at the same time as the planets of the solar system.

The sun and the inner four planets of the solar system glowed in the darkness.

Ninth and most distant planet of the solar system.

"The outmost planet of the solar system has already been transformed.

Chin used nine planets of the solar system to launch this elaborate construction.

"These," he said, "are the ones who have come from the outer planet of the solar system we have watched so many years."

For more than four decades, humans have been sending out spacecraft to explore the known planets of the solar system.

The third planet of the solar system was half Earth and half Mars.

"Captain, the phenomenon has reached the innermost planet of the solar system.

"We have a list of the planets of the solar system that we hand out to students," he said.

"It's the largest planet of the solar system.

He used mathematical methods to study the current climate of inner planets of the solar system.

Scientists say Eros is very old, dating back about 4.5 billion years, and probably represents material present when the planets of the solar system formed.

Jaunting was restricted to the surfaces of the planets of the solar system.

"Vejur's ship," Kirk asked, "why does it travel in toward the third planet of the solar system directly ahead?"

Copernicus proposed from his observations that the planets of the solar system revolved around the sun, not Earth.

The planets of the solar system and their moons were closely observed via numerous space probes.

Some human space travellers are cruising near the outer planets of the solar system with their ship on autopilot.

Jupiter is the largest planet of the solar system, and its moons are the system's biggest and most mysterious.

Pluto, the next to outermost planet of the solar system, didn't receive very much light from the life-giving source.

"With no other planet of the solar system habitable by man, and none of the stars within reach?