The Voyager mission of the 1970s took advantage of a rare alignment of Jupiter, Saturn, Uranus, and Neptune to shave off nearly 20 years of travel time

The space shuttle leaves orbit at 16,465 miles an hour

Space is also dangerous. More than 20 astronauts have died doing their job.

Space travel is nothing like in the movies. Getting from A to B requires complex calculations involving inertia and gravity—literally, rocket science—to "slingshot" from planet to planet

As well as using sonar, Ballard searched for the Titanic's trail of debris. He estimated that it would be over 2km long

It was the most famous ship of all time and explorers were desperate to find it.

The traditional way to search for wrecks was to use sonar. Sonar uses sound to detect objects underwater.

James Cameron, director of the film Titanic, recently became the first person to reach to travel solo to the bottom of the Mariana Trench.

Rumors have surfaced over the years that Ballard wanted to keep the location of the wreck a secret to protect it from salvagers

“The Navy didn’t want to disclose the location of those submarines, so we needed a cover story and Titanic was the cover story,

. The Navy had little interest in funding the search, but it was very interested in finding the USS Scorpion and the USS Thresher, two nuclear submarines that were lost in the 1960s on either side of where the Titanic went down.

we thought we were going to fail. But that was followed quickly by a realization of where we were, that we were on a gravesite. We started seeing where the bodies had landed, that this was a cemetery, and it changed our emotional wall. It went from pure joy to thoughtful reflection.”

The New Evidence, reveals that there were more than likely two other main components that led the ship to disaster.

This documentary focused on several widely unknown aspects of everything that was occurring onboard the ship, prior to and during the sinkin

closing all of her watertight compartments (which made Titanic be deemed “unsinkable” due to the fact that she could stay afloat if four of them filled)

On the night of April 14, 1912, Titanic was traveling through an ice field in the mid North Atlantic Ocean at full speed

many new studies have been done about the sinking of the Titanic, leading to many new theories about exactly what happened in those fateful early hours of April 15, 1912.

Your body wont explode like you see in some movies, but you will be in a world of hurt.

It regulates temperatures. And it wraps us in a cocoon of lovely, lovely air pressure.

The atmosphere protects us from ultraviolet radiation.

Bad things happen, my friends. Lots of bad things. Our bodies depend on Earth's atmosphere to survive. Not just for oxygen. The atmosphere protects us from ultraviolet radiation. It regulates temperatures. And it wraps us in a cocoon of lovely, lovely air pressure. In the vacuum of outer space, all that protection goes away. The most serious danger is asphyxiation. After about fifteen seconds, your body has used up all the oxygen in your blood, and your brain loses consciousness. Now, you might be thinking - I can hold my breath for a minute! That might work underwater or under our atmosphere, but in outer space, there's no outside pressure. With no outside pressure air expands and can rupture the tissues in your lungs. Meanwhile, the water in your body turns into vapor beneath your skin, causing the mother of all bloating. Youll swell to about twice your normal size. Your body wont explode like you see in some movies, but you will be in a world of hurt. After a few minutes, if the lack of oxygen hasn't killed you, the damage from depressurization will. Outer space has other hazards - freezing temperatures, lethal radiation. But here's the good news you won't live long enough to have to worry about them. Despite all the dangers, if youre rescued within 60 seconds, you'd probably survive. You wouldnt be in good shape, but youd be alive. And you'll have first hand knowledge of why you never go to outer space, without dressing up in a nice looking space suit.

Our bodies depend on Earth's atmosphere to survive. Not just for oxygen.

Astronaut Buzz Aldrin studies the moon's soil; on the far right is Apollo 11’s lunar module, the Eagle.

Armstrong and Aldrin went back to work collecting samples of moon rocks and dust. After over two hours, the astronauts brought 47 pounds back onto the lunar module and prepared to rejoin Collins. It was time to go home.

Astronaut Buzz Aldrin's footprint is visible in a shallow moon crater named the Sea of Tranquility.

Just four days after launching from Kennedy Space Center in Florida, the spacecraft neared the moon’s surface.

the two planted the United States’ flag on the surface.

Before touching down, the three men split up. Collins boarded Apollo 11’s command module, the Columbia, where he would remain in orbit around the moon

The Eagle made a risky landing in a shallow moon crater named the Sea of Tranquility. (Most people watching the landing on TV didn’t know that the Eagle had only 20 seconds of landing fuel left at this point.) Armstrong and Aldrin looked out the windows of the module at the lifeless and barren lunar landscape.