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Astronomy 101: Exploring the Outer Solar System

Our final lesson in this part of Astronomy 101 will concentrate primarily on the outer solar system, including two gas giants; Jupiter, Saturn and the two ice giant planets Uranus, and Neptune. There's also Pluto, which is a dwarf planet, as well as other distant small worlds that remain unexplored. Jupiter , the fifth planet from the Sun, is also the largest in our solar system.
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Kilopascal (kPa) Definition

The kilopascal is based on the pascal unit. Here's the definition and a look at the unit's history. Kilopascal or kPa Definition The kilopascal is a unit of pressure. 1 kPa is approximately the pressure exerted by a 10-g mass resting on a 1-cm 2 area. 101.3 kPa = 1 atm. There are 1,000 pascals in 1 kilopascal.
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USS Selfridge (DD-357) from the left

USS Selfridge (DD-357) from the left Here we see the Porter class destroyer USS Selfridge (DD-357) close to an unidentified port, with a second destroyer just behind her. This looks to be a fairly formal occasion, as the crews of both ships are lining the rails (although with the amount of clutter on these ships that isn& 39;t quite as impressive as it was on the flushdeckers).
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How to Make Your Own Invisible Ink

Making invisible ink to write and reveal secret messages is a great science project to try, even if you think you don't have the right chemicals. Why? Because just about any chemical can be used as invisible ink if you know how to use it. What Is Invisible Ink? Invisible ink is any substance that you can use to write a message that is invisible until the ink is revealed.
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Using the French Prepositions 'En' and 'Dans'

In French, the prepositions en and dans both mean "in," and they both express time and location. They are not, however, interchangeable. Their usage depends on both meaning and grammar. How French Prepositions Work In French, prepositions are generally words that link two related parts of a sentence.
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Celebrities Who Speak Spanish as a Second Language

If you're learning Spanish, you're in the company of celebrities. Although there are plenty of famous folks who grew up with Spanish as a first language and have crossed over into English-language celebrityhood, there are some celebs who had to learn Spanish like the rest of us. Here are some you may recognize, although not all of them claim to be fluent: Actors Ben Affleck and his younger brother Casey Affleck learned Spanish while living in Mexico and during film stints in that country.
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