Did any of you notice those strange greenish coloured lights in the sky last night? Anybody? Mark? I did, sir. They were beautiful. But what were they? We call them the northern lights. But they're also called or or as there are two types of or as those in the northern hemisphere and those in the southern hemisphere., in the north, we call them the aurora borealis in the south. There the aurora australia is or as appear as colorful streams of light in the sky in high, northern and southern latitudes. They frequently occur during the months before or after the equinox. The equinox happens in march and September. That's when the planet is tilted, so that it's neither pointed away from nor toward the sun. So, uh, why do or as occur they are the result of reaction in the upper atmosphere. Solar winds hit the earth's magnetic field. This may excite the oxygen and nitrogen atoms in the atmosphere. After some time, the atoms become relaxed. As they relax. The electrons in these atoms give off energy. This energy appears in the form of light. The color of the light depends on whether it comes from oxygen or nitrogen. In addition, the height in the atmosphere helps determine the colors that the light forms also. Um, just so, you know, oxygen usually emits a green or brownish red light. Nitrogen typically gives off a red or blue light. Most are or as are green in color.