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Rap Battle looking at what are the / how do we qualify something to be a planet 

Rap Battle between Brahe & Kepler describing the development on planetary models 

We've seen dozens and dozens of photos and videos of Friday's solar eclipse, but most of them have one thing in common: They're taken from Earth.

The European Space Agency posted an image of the eclipse as seen from an entirely different perspective: space. The agency's sun-watching Proba-2 mini-satellite took this photo Friday, using extreme ultraviolet wavelengths to capture the sun's corona.

How feasible is the Mars One plan?
Currently, it's not. One of the biggest claims made by the Mars One team is that absolutely no new technology needs to be developed for the success of their mission, which is setting up a colony on Mars. We found that there are several cases for systems like the environmental control and life support where that's just not true.

The Mars One project has narrowed down its list of applicants to 100 people, who will now go through further training before the final team is selected.

More than 200,000 people applied to Mars One in 2013, hoping to be chosen to colonize Mars. Applicants had to be at least 18 years old, healthy and between 5'2" and 6'3" tall, as well as fulfilling various personality requirements such as exhibiting adaptability, resiliency, and resourcefulness. During the next round of the selection process, the number was whittled down to 660 during a series of interviews and tests, while the next round will give the remaining 100 people a chance to train in teams in an earthbound copy of the future Mars outpost.

A very cool opinion piece detailing reasons that we should pursue a manned mission to Mars. Could be used to study the topic or to study argumentation.

Overall, Geyer and his team estimated that a small number of nations accounted for the most plastic trash found in the oceans. In fact, 20 countries were responsible for 83 percent of all of the world's mismanaged plastic waste going into the deep blue sea. China was deemed the big bad wolf of plastic waste, generating up to 3.5 million tons of marine junk per year. The United States ranked 20th, dumping about 110,000 metric tons per year.

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.

This video goes over the structures and functions of flowers and how they produce fruit.

Published by McGraw-Hill, a business unit of The McGraw-Hill Companies, Inc., 1221 Avenue of the Americas, New York, NY 10020. Copyright © 2003 by Dr. Larry Jensen. All rights reserved.

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:

This NASA documentary celebrates 50 years of extravehicular activity (EVA) or spacewalks that began with the first two EVAs conducted by Russian Alexey Leonov in March 1965 and American astronaut Edward White in June 1965 . The documentary features interviews with NASA Administrator and astronaut, Charles Bolden, NASA Deputy Administrator and spacesuit designer, Dava Newman, as well as other astronauts, engineers, technicians, managers and luminaries of spacewalk history. They share their personal stories and thoughts that cover the full EVA experience-- from the early spacewalking experiences, to spacesuit manufacturing, to modern day spacewalks aboard the International Space Station as well as what the future holds for humans working on a tether in space. "Suit Up," is narrated by actor and fan of space exploration Jon Cryer. Cryer recently traveled to Star City, NASA Headquarters and the Johnson Space Center to film an upcoming Travel Channel documentary series.

While comets were historically thought to be ill omens of war and famine, recent science has revealed that these celestial wonders actually contain amino acids, the building blocks of life on Earth. Justin Dowd explores the implications of this magnificent discovery.

When you picture a rocket, you might imagine a giant ship carrying lots of fuel, people and supplies. But what if the next wave of spacecraft were small enough to fit into our pockets? Dhonam Pemba details the future of microspacecraft, and how scientists at NASA are hoping to use micropropulsion to launch these tiny vessels outside of Earth's orbit.

Ticks can attack moose in droves, draining their blood and possibly killing them.

A nice collection of video links about the three types of symbiosis -- mutualism, parasitism and commensalism.

Symbiosis is close and often long-term interaction between different biological species.

The definition of symbiosis is controversial among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to all types of persistent biological interactions (i.e. mutualistic, commensalistic, or parasitic).

In this video we show how you can simply visualize all three.

Creature Eats and Becomes Fish Tongue. One of the more bizarre animals roaming around our oceans, this parasitic crustacean not only eats the tongues of fish but also then replaces it. It's chilling to think about, but surprising the fish endures and often resumes a somewhat normal life. Come learn a bit about the Tongue-Eating Louse.

Gross science: This parasite crawls into a fish's mouth and replaces its tongue. Enough said.

Note: In this video, we refer to the parasites as "protoandritic." The real word is "protandric." We take accuracy very seriously and we apologize for the error. Thank you to the viewer who pointed this out.

The first six weeks of Scott Kelly's marathon year aboard the International Space Station (ISS) haven't been easy. There was the reacclimation to zero-gravity, the failure of a Russian cargo ship carrying needed supplies, the cancellation of singer Sarah Brightman's planned visit-to say nothing of the constant, minute-by-minute work schedule that is the stuff of any day aboard the station.

Kelly and astronaut Terry Virts discussed those things and more in one of at least four video chats TIME will conduct with the ISS during our exclusive Year in Space coverage.