She mapped our solar system's "alternate fate" had it housed an extra ... formation of a planet that is at least twice the size of Earth's mass—a super-Earth—instead of an asteroid belt.

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Computer simulations suggest that there is an undiscovered Earth-like ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

Harvard and Smithsonian (CfA), and its Submillimeter Array (SMA), were critical for identifying a cache of belts surrounding other stars beyond the sun where comets may reside. Regions around 74 stars ...

and may even have provided the right conditions for life on Earth. But as far as we know, no other bodies in the solar system exhibit plate tectonics today. Why is our world different?