Amina Khan

Gentlemen, take note: If your wife has stopped calling you as much as she used to and you feel like you're being replaced, you might be right to suspect that there's someone else in her life. But it's not another man -- it's another woman. And she's probably your own daughter.

While men tend to maintain a woman as their closest confidant throughout their adult lives, women's focus shifts from their spouse to their adult daughter as they age, according to an analysis of nearly 2 billion cell phone calls and almost half a billion text messages.

The smallest planet in the solar system keeps serving up big surprises. Scientists working on the Messenger mission to Mercury have found that the planet has unexpected inner layers and craters with tilted bottoms, and it may have been geologically active far later into its life than previously imagined.

Lean financial times are prompting belt-tightening far and wide -- and now that extends to Mars and the rest of the solar system.

President Barack Obama's proposed budget for the National Aeronautics and Space Administration for fiscal year 2013 would eliminate $300 million from the agency's planetary sciences division, a 20 percent cut from the $1.5 billion it received for 2012. Though the budget plan, released last week, would preserve funding for high-profile projects like the James Webb Space Telescope and manned space missions, scientists were alarmed by the hit to relatively inexpensive programs that explore the solar system with high-tech robots.

Type 1a supernovae, exploding stars that can outshine entire galaxies, were instrumental to the Nobel Prize-winning discovery that a mysterious "dark energy" is fueling the expansion of the universe. But astronomers haven't been able to pin down what causes these massive stellar explosions.

Now, after studying a Type 1a supernova in a nearby galaxy, two researchers say that they must be the result of a collision between two white dwarf stars. They made their case this week in the journal Nature.

Albert Einstein had the idea. A century of observations have backed it up. It’s one of the cornerstones of physics: Nothing travels faster than the speed of light.

Scientists have isolated a viral gene that induces zombie-like behavior -- in caterpillars. The virus causes gypsy moth caterpillars to climb to the tops of trees, where they die and their disintegrating bodies rain infectious particles on their unsuspecting brethren below.