Comets

New discoveries are causing astronomers to question if the Big Bang really happened, and using the latest science, they investigate if it wasn't just the start of our universe but many mysterious multiverses.

Dark matter and dark energy are locked in an epic battle for control of the cosmos, and the winner will determine the fate of the universe. New discoveries might reveal which force will emerge victorious.

The latest discoveries suggest that we might be on the verge of discovering life beyond our planet, and scientists are investigating if earth's life began elsewhere in the universe, and whether we need to evolve to know for sure.

New discoveries have revealed thousands of exoplanets beyond our solar system. Some resemble earth enough that one could be a new home for humanity. Even with cutting-edge technology, finding the perfect one is the scientific challenge of the age.

For twenty years, NASA's Cassini spacecraft revealed the strange secrets of Saturn until it vaporized in its atmosphere in a blaze of glory. But today its legacy lives on, as fresh data from the probe helps scientists make brand-new discoveries.

If a massive asteroid collides with earth, it could end life on our planet as we know it; new discoveries and cutting-edge tech reveal just how close we are to apocalypse and what it would take for the world's leading space agencies to stop it.

NASA is on a mission to send humans to Mars within just 15 years, but to reach this next frontier of space exploration, experts must discover new technology and cutting-edge science that protects astronauts from the Red Planet's deadliest killers.

From the mission that saw Pluto for the first time to the Mars rovers, a new breed of explorers are risking their careers, and even their lives, to lead humanity to worlds we have never seen and tackle the mysteries of life itself.

Meet the scientists across the world on the hunt for dark energy, an unknown form of energy which is hypothesized to permeate all of space and may be accelerating the expansion of the universe.

An exploration of the dramatic fate of our future descendants, the technology they'll need to survive the end of this world billions of years from now, and our options for colonizing a new planet somewhere far from Earth.

A soaring quest through the solar system's exotic and hidden water realms, from the deep seas below the icy crust of Europa to the vast prehistoric oceans that once existed on Mars billions of years ago.

The story of how a large aerospace company, BAE Systems, began a secret project to counter the force of gravity while NASA simultaneously ran a similar 'Breakthrough Propulsion Physics' program

The future of space travel is under attack -- by millions of pieces of debris from old satellites and missions that surround Earth. Go inside the effort by the U.S. government and others to combat the lethal threat of space junk.

A team of scientists are looking for the very first stars in the universe, which were born moments after the Big Bang and gave creation the earliest ingredients for life. Go inside this groundbreaking quest for this pivotal moment.

Go inside the final moments of NASA's Cassini 20-year mission, a which explored Saturn and its moons. Cassini revealed the secrets of strange new worlds that could harbor life, changing everything we know about the solar system.

By looking closely at the common icicle physicist Stephen Morris reveals how science can be a powerful lens through which to view the mystery & beauty of everyday phenomena. Photographer Don Komarechka captures the amazing patterns of ice-bubbles.