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"The Earth Moon Sun System. The orbit of the moon around the earth, the orbit of the earth around the sun, and a discussion of the relative sizes and distances. From the Physical Science course by Derek Owens."

In a sneak peek of a possible future mission to Saturn's moon Titan, NASA has showcased their vision of a robotic submersible that could explore the moon's vast lakes of liquid methane and ethane.

VIDEO: Can a Moon be Older Than its Planet?

Studying Titan is thought to be looking back in time at an embryonic Earth, only a lot colder. Titan is the only moon in the solar system to have a significant atmosphere and this atmosphere is known to possess its own methane cycle, like Earth's water cycle. Methane exists in a liquid state, raining down on a landscape laced with hydrocarbons, forming rivers, valleys and seas.

When the moon passes through the Earth's shadow, it causes the moon to look very unusual for a short period of time. This event is called a lunar eclipse, and it occurs roughly twice a year. There's one viewable to folks outside of North America on June 15, so sit back and learn more about how lunar eclipses work in this video!

"In science fact, though, there's greater concern that Earth-dwellers-specifically bacteria and microorganisms-could arrive at extraterrestrial destinations. As NASA sends rovers to Mars, plans a trip to Jupiter's icy moon Europa, and looks for an ocean on Saturn's moon Enceladus, the hope is to find life-forms on those interstellar bodies. To ensure that doesn't include forms that originated on Earth-and that the new environment isn't compromised the way Earth ecosystems can be by invasive species or infectious diseases-NASA is now thoroughly cleaning its space-bound vessels."

A new documentary from NASA tells of the difficulties of sending an astronaut into cold, deadly space, plus how far we've come since Gemini 4. Since the days of the first "extra-vehicular activities", spacewalks have allowed mankind to walk on the Moon, build the International Space Station, and save the Hubble telescope. And we're not done yet. Future spacewalks will take us even farther-to asteroids orbiting the Moon, and eventually, Mars. Check out the documentary to learn more:

"tarting 35 years ago, our view of the solar system was forever changed. The launch of the Voyager 1 probe on Sept. 5, 1977 ushered in a golden era of planetary exploration. Along with its sister probe, Voyager 2, the spacecraft took the first detailed images of planets in the outer solar system, discovering magnificent rings, churning atmospheric processes, and volcanic activity on tiny moons. Voyager 2 actually launched on Aug. 20, slightly earlier than its counterpart, but took a longer route to reach Jupiter and Saturn after Voyager 1. The Voyager probes were a scaled-back version of a proposed "Grand Planetary Tour" mission, which would have used a rare alignment in the outer solar system to swing from planet to planet with minimal fuel. In the original plan, four spacecraft would have visited all the gas giants and even tiny Pluto (then still a planet). But without budgetary support from President Nixon and Congress, the ambitious mission was canceled. Since the 1977 planetary configuration occurred only once every 177 years, NASA engineers decided to go forward with a new plan - the Voyager probes, two identical robots that would travel to Jupiter and Saturn and, if successful, on to Uranus and Neptune. Voyager 1 ultimately performed a closer encounter with Saturn's moon Titan that flung it out of the solar system, and only Voyager 2 made it to the latter planets."

"This full photo realistic animation of a complete cycle of the moon (known as a "synodic month" or "lunar month") was completed in collaboration with, and based upon photos taken by Steampunk artist Dr Tim Wetherell for his large wall mounted project "Clockwork Universe" commissioned and to be shown at Canberra's Questacon - National Science and Technology Centre."

NASA Sci Files segment explaining the phases of the moon and how they are created.

"Russia plans to send probes to Jupiter and Venus, land a network of unmanned stations on Mars and ferry Russian cosmonauts to the surface of the Moon - all by 2030. That's according to a leaked document from the country's space agency. Wired U.K. The cosmically ambitious plans were submitted to the government by the Russian Federal Space Agency (Roscosmos) this month, according to a report in the Kommersant, Russia's business-focused daily newspaper. The document lays out a blueprint for the country's space industry to follow in the next 18 years, up to 2030. It's rare for Russia to set a deadline for its future space plans."

For the first time in the history of humankind, economical participation in space exploration is a reality. With Mars One's recent launch of a crowdfunding campaign, it's now possible to send a personal item to distances far beyond your wildest dreams. For many, the Mars One mission is the gateway to a new era in man's historic reach for the stars.

For about 50 years, government organizations have been funding and managing space exploration across the globe. Government run exploration, funded by public monies, has provided limited access to most citizens of those countries. In the last few years, private organizations such as Richard Branson's Virgin Galactic and Eric Anderson's Space Adventures have made space exploration possible for the mega-rich. A flight with Virgin Galactic 68 miles above Earth goes for a cool $250,000 while the potential 2017 flight to the moon from Space Adventures is rumored to cost an astronomical $150 million. There are others in between, but none as accessible as Mars One. Bas Lansdorp, co-founder of Mars One, has set his sights on involving the everyday man and woman in space exploration

Have you ever looked up at the stars and felt small? Have you ever looked at the Moon and thought, "Wow! It looks huge!"? This video gives us perspective on those questions.

Now, in a newly released view of Europa's cracked surface, ruddy veins of hydrated salts mixed with chemicals such as magnesium sulfate or sulfuric acid break up bluish slabs of pure water ice. Compiled from data collected by NASA's Galileo spacecraft, this image release only amplifies our fascination for the moon.

The space program was forged from paranoia and fear. Our first rockets were weapons. Our first moves into the world beyond our own were motivated by competition. But when we finally got ourselves into space -- when we first traveled around our lonely planet, and took our first bounding leaps on the moon -- many of those baser motivations transformed into something more transcendent and profound: Space came to mean something much more than ideology. Space ended up teaching us about life on Earth.

"Curiosity, you are such an amazing space mission that we will sacrifice a thousand blog posts, a million gallons of newsprint even, in your honor. But can you do this? NASA's Cassini probe, not content to be forgotten in its faraway orbit around Saturn and its moons, has beamed back new natural-color images of the ringed planet that are absolutely breathtaking. Released yesterday, they show a very different planet than the one Cassini arrived at eight years ago."

"Ocean tides rise and fall twice a day, influenced by the gravitational forces of the sun and moon. Studying tides' rhythmic movements helps us understand both the ocean and the cosmos. Astronomer Ben Burress explains how tides work, and QUEST visits Crissy Field in San Francisco to see the oldest continually operating tidal gauge in the Western Hemisphere."

Scientists believe there is an ocean hidden beneath the surface of Jupiter's moon Europa. NASA-JPL astrobiologist Kevin Hand explains why scientists are so excited about the potential of this ice-covered world to answer one of humanity's most profound questions.

Undersea footage provided by John Delaney, University of Washington

Could a liquid water ocean beneath the surface of Jupiter's moon Europa have the ingredients to support life? Here's how NASA's mission to Europa would find out.