Browsing All Posts filed under »Astronomy«

Bad Movie Physics: A Report Card

December 29, 2010 by

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Space epics almost always play fast and loose with science, treating the laws of physics like suggestions. But some movies dismember Newton and Einstein with way more gusto than others. Here’s our report card for bad science in 18 movies. via Bad Movie Physics: A Report Card.

ScienceDaily: Relativity and the twin’s paradox

September 24, 2010 by

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ScienceDaily (Feb. 15, 2007) — Subhash Kak, Delaune Distinguished Professor of Electrical and Computer Engineering at LSU, recently resolved the twin paradox, known as one of the most enduring puzzles of modern-day physics.

ScienceDaily: Relativity and time dialation works in daily life

September 24, 2010 by

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Scientists have known for decades that time passes faster at higher elevations, and more slowly when you move faster, curious aspects of Einstein's theories

Discovery of a possible Earth-sized planet

August 29, 2010 by

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The journal Science reports the following in the article  Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations — Holman et al., 10.1126/science.1195778 — Science: The Kepler spacecraft is monitoring over 150,000 stars for evidence of planets transiting those stars. We report the detection, based on 7 months of Kepler observations, […]

Vast solar system found 127 light years away

August 27, 2010 by

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The five strongest signals corresponded to planets with Neptune-like masses, between 13 and 25 times that of the Earth. These planets, with orbit periods ranging from six to 600 days, are separated from their star at 0.06 to 1.4 times the distance between the Earth and sun. Dr Lovis added: ”We also have good reasons […]

Interactive tool: Practice estimating relative sizes

August 26, 2010 by

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Interactive tool for practicing comparing two lengths, areas, and volumes. It is VERY TRICKY to judge how area and volume change with size. This tool gives you good practice. Good for physics problems to do with pressure, gravity, and other places where area or volume are important. Explore size estimation in one, two and three dimensions! Multiple levels of difficulty allow for progressive skill improvement.

Interactive simulation of Vector addition (PhET / UC Boulder)

August 26, 2010 by

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Interactive simulation of vector addition. Let's you practice adding vectors in arrow style to get a feel for the math. Learn how to add vectors. Drag vectors onto a graph, change their length and angle, and sum them together. The magnitude, angle, and components of each vector can be displayed in several formats.

How to: Conversions using the factor-label method (Wikipedia)

August 26, 2010 by

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Brief instructions and example showing how to convert between units (say, from mi to m) using conversion ratios. Converting from one dimensional unit to another is often somewhat complex and being able to perform such conversions is an important skill to acquire. The factor-label method, also known as the unit-factor method or dimensional analysis, is a widely used approach for performing such conversions

How to: Entering scientific notation on a calculator (TI)

August 26, 2010 by

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Short 'how to' showing how to enter scientific notation on a TI (Texas Instruments) calculator. Use the Enter Exponent or [EE] key to enter numbers in scientific notation. The [EE] key is used to denote x10 for numbers written in scientific notation. Note: TI calculators use the EE button. Some calculators use the Exp button. If you don't know how to use these, you will waste your time and on some problems you'll get the wrong answer.

Online tutorial: Scientific notation (UCel)

August 26, 2010 by

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Online tutorial on using scientific notation to describe and compute with really large and really small numbers. Great review! 17 short Flash tutorials delivered in a charming British female voice. Good graphics and examples moving step-by-step through the use of scientific notation.