| Universe Facts |
| In honor of the original thirteen states, the U.S. $1 bill has the following on the back: 13 steps on the pyramid. The motto above the pyramid has 13 letters (annuity coatis). E pluribus Unum, written on the ribbon in the eagle's beak, has 13 letters. 13 stars appear over the eagle's head. 13 stripes are on the shield. 13 war arrows are in the eagle's left talon. |
| All of the stars comprising the Milky Way galaxy revolve around the center of the galaxy once every 200 million years or so. |
| Stars come in different colors; hot stars give off blue light, and the cooler stars give off red light. |
| Stars with really strong gravity cause themselves to become smaller and smaller and eventually turn into black holes. |
| You can see stars from the bottom of a well even in day light. |
| Uranus' axis is at 97 degrees. which means that it orbits on its side. (Most of the planets spin on an axis nearly perpendicular to the plane of the ecliptic but Uranus' axis is almost parallel to the ecliptic.) |
| The three most recently discovered planets were Uranus in 1781, Neptune in 1846, and Pluto in 1930. |
| Mercury is the only planet whose orbit is coplanar with its equator. Venus and Uranus are the only planets that rotate opposite to the direction of their orbit. |
| Jupiter has the shortest day of all the planets. Although it has a circumference of 280,000 miles compared with Earth's 25,000 Jupiter manages to make one turn in 9 hours and 55 minutes. |
| If you are having problems remembering the planets in their correct order, just remember this sentence "My very educated mother justed served us nine pickles," Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. |
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