Most black holes probably form when supermassive stars collapse into a dense gravitational mass that absorbs all light.

If black holes are really just the entrance to worm holes we may be able to use them as shortcuts to travel through time and space.

In 1924, Edwin Hubble discovered that there were more galaxies other than the Milky Way.

The sun has been lighting our planet for 4.6 billion years and dominates all life on Earth -- but it's a speck in comparison to the other stars in the universe.

Symmetry and sex appeal go hand in hand. See how strangers perceive beauty in an experiment based on facial symmetry.

Research has shown that a woman's sense of smell protects her from mating with a relative. Find out how in Discovery Channel's "The Science of Sex Appeal."

Why are women more selective than men? It's biological. Find out why from Discovery Channel's "The Science of Sex Appeal."

Are humans biologically programmed to mate for life? Learn surprising strategies of human mating, in Discovery Channel's "The Science of Sex Appeal."

Why is the shape of the body so important? Scientist Kerrie Johnson has determined certain shapes that drive us wild. Get more in Discovery Channel's "The Science of Sex Appeal."

If humans are biologically built to stray, is there any hope for love for life? According to professor Helen Fisher, there are signs of it all around us.

A woman's voice changes with her monthly cycle. Science says this is perceived as more attractive. See for yourself.

Could copulance be a hidden weapon in women's armory of attraction? Men seem to lose all ability to think clearly when exposed. Learn more from Discovery Channel's "The Science of Sex Appeal."

While scouting for an attractive partner, you might have to settle for someone "in your league." Watch a mate selection experiment in Discovery Channel's "The Science of Sex Appeal."

What makes a voice attractive? Here's what science says. Discover what qualities are most desired by the opposite sex in Discovery Channel's "The Science of Sex Appeal" program.

Your skin can send sexual signals too. How? See the science behind the attractiveness of flesh in Discovery Channel's "Science of Sex Appeal" program.

What types of body movements are considered sexy? Watch a study of human body motions in Discovery Channel's "The Science of Sex Appeal" program.