Razorback and Icewave exchange blows in the hard-hitting series premiere of BATTLEBOTS.

Watch some serious sparks fly as Icewave's propellor rips Razorback to shreds.

Watch Bite Force take a bite out of Warhead in this round of Battlebots.

Watch things get so heated that sparks begin to fly between Nightmare and Warrior Clan in this round of Battlebots.

Next-generation robots duke-it-out to become the BATTLEBOT champion.

Here are the hardest hits from the qualifying round.

The judges to make a tough call after a controversial battle between Overhaul and Lock-Jaw.

Tombstone a force to be reckoned with in this battle between Tombstone and Counter Revolution.

After a nullified first round bout, Complete Control and Ghost Raptor go head-to-head.

More hard-hitting robot action from the qualifying round.

Two unarmed bots face off in a hazard-filled duel of wits and destruction.

Chomp goes head-to-head with Icewave in this destructive showdown.

Stinger shows no mercy in this battle against Warhead.

The bots battle to separate themselves from the pack in the round of 16.

HyperShock shocks the judges by coming out as a fierce underdog in this battle between Bite Force and HyperShock.

Tombstone shows another bot to their grave in this battle between Tombstone and Overhaul.

Tombstone and Yeti go the distance in a no-hold-barred slug-fest.

Razorback and Icewave exchange blows in the hard-hitting series premiere of BATTLEBOTS.

Next-generation robots duke-it-out to become the BATTLEBOT champion.

Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.

Since the 1960s, NASA has been keeping an eye on man-made objects in space. Here, engineers are replicating the devastating impact of space debris. 'Alien Encounters' airs Tuesdays at 10/9c.

Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.

What would receiving a message from an alien civilization tell us about human evolution, and about surviving the most serious problems facing our planet?

Since launching in 2009, the Kepler program has detected hundreds of previously unknown planets. How many of them are Earth-like, and what does that mean for the probability of intelligent life beyond our solar system?

It's likely that an advanced civilization would combine the advantages of a machine with the advantages of biological systems.

It's possible that life on earth began off-planet and spread here.

An alien spacecraft might not rely solely on sunlight to power its trajectory. Find out what other energy technology aliens could use to travel through the universe.

Will ETs look like us? Will they resemble giant insects? Scientists debate how various environments could have created life forms beyond our wildest imagination.

If the chirality of aliens is different than ours, it couldn't interact with us, and therefore would be non threatening.

It's 1967, the Cold War is on and there's a glowing orange light hovering over a U.S. Air Force base.

John Smith and his cousin Billy have a mysterious encounter while driving on a remote highway in the Yukon. Was it a UFO?

The Hale - Bopp comet was overhead but a strange formation of lights in the sky didn't appear to be natural.