"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."

"An extraordinary timelapse video created with pictures from the International Space Station shows Earth as it has never been seen before. The video, called Further Up Yonder, was made by Italian film student Giacomo Sardelli using Nasa stills. Sardelli calls the film a message from the ISS to all humankind "

"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."

This infographic from Nova introduces students to the reasons that tides happen.

"Astronomers have a mind-blowing new theory: that there are 17 billion Earth-sized planets in our galaxy. They don't yet know how many of these worlds are in habitable zones, but the implications of this discovery are amazing. So much that some claim the "quest for a twin Earth is heating up." Simply put: If there are 17 billion Earth-sized worlds in our galaxy, it's clear that the Universe is bubbling with life."

"Join astronomers in a race to find a planet that can sustain life. Amid all the space in the universe, is there another world like ours? Astronomers studying a nearby star say they've found the first potentially habitable planet."

"We exist to make the capability of human travel beyond our solar system a reality within the next 100 years. We unreservedly dedicate ourselves to identifying and pushing the radical leaps in knowledge and technology needed to achieve interstellar flight, while pioneering and transforming breakthrough applications that enhance the quality of life for all on Earth. We actively seek to include the broadest swath of people and human experience in understanding, shaping and implementing this global aspiration. Taking up this task ignites not only our imagination, but the undeniable human need to push ourselves to accomplishments greater than any single individual."

"As a life support engineer at NASA Ames Research Center, it's Michael Flynn's job to keep astronauts alive in space, making sure they have the basic necessities like clean water to survive. But launching clean water into space is cost-prohibitive, so for years, Flynn and his team have been working on new ways to recycle waste water into safe, drinking water. SmartPlanet visits Flynn's lab and looks at how he's doing it through a process known as "forward osmosis.""

A video from a female astronaut on the International Space Station showing how she washes her hair.

"NASA eClips™ are short, relevant educational video segments. These videos inspire and engage students, helping them see real world connections."

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.

"The spacesuit is the unsung hero of the space industry. It doesn't boast the massive thrust of a rocket, nor does it have the panache of a lunar lander. But the spacesuit is a marvel. It's a mini-spaceship in its own right, designed to protect the most iconic symbol of all: the astronaut. However, the spacesuit isn't without its flaws - just look at some of the funny outtakes from the Apollo landings. That's why it's evolved in the past few decades. With 11 layers of materials, the suit takes years to produce and costs millions of dollars. Each astronaut spends quality time with his or her suit before going into space, donning it for up to 10 hours per day during training. "

"Now, to mark the record-breaking dive's one-year anniversary, Red Bull (Baumgartner's sponsor for the dive) has released another video of Baumgartner's freefall - this one explicitly shot from Baumgartner's point of view. It's the same spinning and breathing and terror-mongering you might recognize from the originally published video, except even more intimate. And even more exhilarating."

"The Why Files is a good website that I discovered in a Classroom 2.0 discussion. The Why Files is a resource designed for students to learn about the science of stories in the news. The Why Files doesn't cover every news story, just the stories that have clear connections to science concepts. For example, one of the stories on the front page over the weekend was about the start of Hurricane Season. The story goes on to explain in text, image, and video the science of hurricane formation."

"The Spangler Effect is a new YouTube channel from Steve Spangler Science. Unlike his popular Sick Science videos which are no more than short demonstrations of science experiments students and parents can do at home, The Spangler Effect videos offer longer (15 minutes or so) explanations of science experiments. The Spangler Effect videos explain the science of do-it-yourself experiments and how you can recreate those experiments at home or in your classroom"