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Gravity rules the life cycle of stars. During the Red Giant dying stage in the life of an average size star, its outer layers are blown off in vast clouds of dust and gas called "nebulae" that contain hydrogen, oxygen, and nitrogen. Gravity crushes the remaining atoms into a remnant core called a white dwarf. The gravity of giant stars-10 to 20 times larger than average-will, at the end of their life in a supernova explosion, crush together even mutually repulsive protons and electrons, leaving a remnant rotating core of neutrons (i.e., a pulsar). Also explains how stars 20 to 100 times average size collapse into a core so dense that its gravity doesn't even allow light to escape (i.e., a black hole).
(Source: DCMP)
Scientists learn the basic properties of stars by analyzing the light they emit. Clarifies how brightness and luminosity are determined, discusses stellar parallax, and explains star color and characteristics. Focuses on yellow, blue, and red stars, white dwarfs, red giants, black holes, and supernovae.
Students explore the outer planets of the solar system. Vivid, colorful images transmitted by exploratory spacecraft serve as the basis of this video tour of Jupiter, Saturn, Uranus, and Neptune. Often referred to as the "gas giants," the unique features of these large and distant planets are described. Jupiter's Giant Red Spot, Saturn's colorful rings, and the fierce storms of Neptune are highlights of the program. Important terminology includes: sun, rotation, revolution, orbit, ellipse, gravity, inertia, telescope, Hubble telescope, exploratory spacecraft, asteroid belt, meteoroid, and comet.
Shares a broad look at stars--their formation, life, and types of death. Mentions red giants, blue stars, supernovas, red dwarfs, black holes, and others. Notes that astronomers study a star's light to learn about it. Projects what will happen to our star, the sun.
As shown on the History Channel. The Grand Canyon is nearly 300 miles long and over a mile deep. You could stack four Empire State buildings one on top of the other, and they still wouldn't reach the lip of the Canyon. As vast tectonic plates clash and grind against one another a giant plateau has been pushed up over a mile in the air. The Colorado River, flowing from high in the Rockies and carrying a thick load of sediment, has carved the canyon in the rising plateau.
Perfectamundo isn’t so perfect anymore. The trash is out of control. A giant garbage heap threatens to break through the cybersite’s dome, and the CyberSquad must become garbologists to reduce the rubbish. Part of the "Cyberchase" series.
In this footage, two citizen scientists are studying butterflies and conducting biological surveys of varied ecosystems in the Red Hills and Apalachicola National Forest. They document the wide diversity of butterflies in the region. Part of the "Roaming the Red Hills" series.
Mars definitely has a reddish tint, and even the ancient Egyptians called Mars “The Red One.” Where does the redness come from? The rocks on Mars are full of iron, and the dust from those rocks swirls around the atmosphere, which makes the planet appear red. Part of the “Mars in a Minute” series.
Christmas Island, discovered December 25, 1643, is just a spec of land in the Indian Ocean. The annual red crab migration at the beginning of the rainy season, however, is so massive it can be seen from the air. It has been named a wonder of the natural world. Follows this terrestrial arthropod from its rainforest burrow, across dangerous landscape to the ocean to mate.
Molecular biologist Scott Santos and his team at Auburn University are studying an unusual and endangered ecosystem in Hawaii called Anchialine pools. A threatened ecosystem, Anchialine pools are inland lava depressions found near the ocean that feed off fresh water aquifers. Little is known about the creatures and plants that live in these brackish waters, but a number of the lava pools are being destroyed by invasive species and development. With support from the National Science Foundation, Santos and his team captured video and photographs of this unique habitat during a two month field study. He hopes his research will help save the pools before they totally disappear. One of the most famous creatures in the Anchialine pools is a legendary tiny red shrimp.
Peter Pritchard has seen each of the world's 300 species of turtles, but has a real affinity for the giant leatherback sea turtles on a Guyana beach. His conservation efforts with a local community insure that children learn about the turtles' habitats, behaviors, and characteristics. Watch a turtle lay her eggs and see the newly hatched babies race for the sea. Gives additional pertinent facts about this ancient species.
Megaloceros was one of the largest members of the deer family ever to walk the Earth. The archaeological record is full of evidence that human ancestors lived alongside and interacted with these giant mammals for millennia. Part of the “Eons” series.
Just a few thousand years ago, the island of Madagascar was inhabited by giant lemurs. How did such a diverse group of primates evolve in the first place, and how did they help shape the unique environments of Madagascar? Part of the "Eons" series.
Bill Nye goes deep inside Jupiter’s mysterious Great Red Spot. First discovered over three centuries ago, this super storm is a gigantic, swirling mass of gas and clouds that is bigger than three Earths combined. NASA’s “Juno” mission hopes to reveal many of the secrets of the Great Red Spot. Part of the “Why With Nye” series.
Getting a giant squid from New Zealand to New York is no easy feat. Curator Neil Landman tells the tale of a sizable specimen’s journey to the collections at the American Museum of Natural History, and Curator Mark Siddall explains why this giant cephalopod has a new name. Part of the "Shelf Life" series.
In Cambodia's Mekong River, the giant catfish is in danger of extinction. Can it be saved? Segment of video from Wild Chronicles Series.
The Red Centre of Australia is one of the most inhospitable environments on Earth, and yet it teems with an extraordinary array of wildlife. Most of which is found nowhere else. Some of the secrets of this location include the diversity of Australia's various environments. Part of the "Nature's Microworlds" series.
In part six of the exploration of north Florida and south Georgia, children immerse themselves in turtles, frogs, fish, and butterflies found living along the Ochlockonee River. Part of the "Roaming the Red Hills" series.
This giant moray eel likes to hide among reefs and can grow as long as 13 feet. It has a second set of jaws in its throat that grabs prey and drags it into its mouth. Now that's one weird animal. Part of the "Weird Animal" series.
Goliath groupers are the largest of the groupers in the Atlantic basin. They were once so overfished in the Southeastern United States, they were considered for listing under the Endangered Species Act. Thankfully, a dedicated group of marine scientists worked to prompt NOAA to ban all of their harvest. This action in the early 1990s gave the grouper time to recover and gave scientists time to learn more about this fish.
Showing collections 1 to 5 of 5
Biology related concepts
A collection containing 59 resources, curated by Benetech
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
