Whether we’re zooming in to the wavelength of a gamma ray or zooming out to the size of a galaxy, it can be difficult to wrap our heads around the big numbers we’re measuring—like nanometers (10-9meters) or gigameters (109).
Take a look at these efforts to represent big numbers. What are the strengths of each? How would you represent a large number (like a gigameter)? Cary Huang: The Scale of the Universe 2 NOVA: A Sense of Scale: String Theory Chris Jordan pictures some shocking stats More than 2,400 years ago, the Greek philosopher Democritus began thinking about how many times matter could be divided. He proposed that there were, in fact, tiny, indivisible pieces of matter that he called “atomos,” meaning “not to be cut.” The Science Of Fireworks.
Parts of a plant. Parts Of Plants we eat. The Photosynthesis Cycle". The Earth's atmosphere is mostly composed of nitrogen.
Oxygen makes up just 21 percent of the air we breathe. Carbon dioxide, argon, ozone, water vapor and other gasses make up a tiny portion of it, as little as 1 percent. These gasses probably came from several processes as the Earth evolved and grew as a planet. But some scientists believe that the Earth's atmosphere would never have contained the oxygen we need without plants. Plants (and some bacteria) release oxygen during photosynthesis, the process they use to change water and carbon dioxide into sugar they can use for food. Photosynthesis is a complex reaction. 6CO2 + 12H2O + Light -> C6H12O6 + 6O2+ 6H2O In other words, while we inhale oxygen and exhale carbon dioxide, plants inhale carbon dioxide and exhale oxygen. Without the sun to feed plants (and the plants to release oxygen), we might not have breathable air. Obviously, plants are important, but not just because they give us food to eat and oxygen to breathe. Plants. The Energy Story - Introduction.
Energy is one of the most fundamental parts of our universe.
We use energy to do work. Energy lights our cities. Energy powers our vehicles, trains, planes and rockets. Energy warms our homes, cooks our food, plays our music, gives us pictures on television. Energy powers machinery in factories and tractors on a farm. The Earth and Beyond. Welcome to The Earth and Beyond Hello, my name is Tim O'Brien.
I'm an astronomer working at The University of Manchester's Jodrell Bank Observatory. As an astronomer my job is to try and understand how the universe works and my main interest is why some stars explode - more about this later! I also get to visit lots of schools and share amazing facts with children and teachers about the Sun, Earth and Moon, the stars and planets, and the Universe as we know it! Now, in the Children’s University, I can share the excitement with you. The Elements Revealed: An Interactive Periodic Table.
In the October 2011 issue of Scientific American, we celebrate the International Year of Chemistry. Learn more about its impact on our daily lives in our Special Report. UPDATED: 06/18/2013 In honor of the 2013 Lindau meeting, which focuses on chemistry, we have updated our interactive periodic table with links to Nature Chemistry's In Your Element essay series. Each essay tells the story of a particular element, often describing its discovery, history and eventual uses. Main Sources & More to Explore: Secondary Science. Primary Science. Animal Sciences Activities and Games Free Downloads.
Free biology Animations- Learnerstv.com. Botany Activities and Games Free Downloads. The Arthropod Story. Human Anatomy: Learn All About the Human Body at InnerBody.com. 125 Great Science Videos: From Astronomy to Physics & Psychology. Astronomy & Space Travel A Brief, Wondrous Tour of Earth (From Outer Space) – Video – Recorded from August to October, 2011 at the International Space Station, this HD footage offers a brilliant tour of our planet and stunning views of the aurora borealis.A Universe from Nothing – Video – In 53 minutes, theoretical physicist Lawrence Krauss answers some big enchilada questions, including how the universe came from nothing.A Year of the Moon in 2.5 Minutes – Video – The Lunar Reconnaissance Orbiter has been orbiting the moon for over a year.
The footage gets compressed into 2 slick minutes.A Day on Earth (as Seen From Space) – Video – Astronaut Don Pettit trained his camera on planet Earth, took a photo once every 15 seconds, and then created a brilliant time-lapse film.Atlantis’s Final Landing at Kennedy Space Center – Video – After more than 30 years, the space shuttle era comes to a close. Video runs 30 minutes. Physics Biology & Chemistry Environment, Geology and & Ecology. The Photosynthesis Cycle" The Particle Adventure. Zooniverse - Real Science Online. The Amoeba Sisters - The Amoeba Sisters.