Tanya Barrett

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Recent Reviews by Tanya


Thu Oct 15, 2015 5:37 PM
4 Earth, Sun and Moon
The sci pack provides an understanding of the moon’s orbit around Earth and the phases of the moon as experienced from Earth’s surface. It was interesting and informative.


Thu Oct 15, 2015 5:33 PM
4 Our Universe
Quite possibly the most popular theory of our universe's origin centers on a "cosmic cataclysm" unmatched in all of history—the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed, in all directions, as if they had all been propelled by an ancient explosive force. Before the big bang, scientists believe, the entire vastness of the observable universe, including all of its matter and radiation, was compressed into a hot, dense mass just a few millimeters across. This nearly incomprehensible state is theorized to have existed for just a fraction of the first second of time. Proponents of the big bang suggest that some 10 billion to 20 billion years ago, a massive blast allowed all the universe's known matter and energy—even space and time themselves—to spring from some ancient and unknown type of energy. The theory maintains that, in the instant—a trillion-trillionth of a second—after the big bang, the universe expanded with incomprehensible speed from its pebble-size origin to astronomical scope. Expansion has apparently continued, but much more slowly, over the ensuing billions of years. Scientists can't be sure exactly how the universe evolved after the big bang. Many believe that as time passed and matter cooled, more diverse kinds of atoms began to form, and they eventually condensed into the stars and galaxies of our present universe.


Thu Oct 15, 2015 5:23 PM
3 The Planets
This sci pack explores the similarities and differences in the planets that make up our solar system. Each planet moves around the Sun in the same direction in a nearly circular orbit, though each planet has its own unique orbital period and speed. Each of the planets vary in size, surface and atmospheric composition, and surface features. In orbit around the planets, we find a great variety of moons, flat rings of rock and ice debris, and/or artificial satellites. Features of many of the planets and their moons show evidence of formation and evolutionary processes similar to those that occur on Earth. These processes include earthquakes, lava flows, erosion, and changes in the atmosphere. The worlds of our solar system come in all shapes, sizes, and colors. Red-eyed Jupiter, ringed Saturn, and frigid Uranus and Neptune are giant gassy globes containing nearly all of the matter in the solar system. These Jovian planets, or gas giants, are huge worlds of air, clouds, and fluid that may have no solid surfaces no matter how deep you go. Everything else in the solar system is just rock, ice, and dust. The largest rock balls are known as the terrestrial planets: Mercury, Venus, Earth, and Mars, with our Moon usually considered part of the club, and now Vesta is applying for membership. Earth is the biggest of all the rocky worlds. While the sci pack is interesting some of the information is very technical. I did recall quite a bit from previous lessons focused on the solar system.