The best time to watch for Orionid meteors will come during the predawn hours of Friday morning, Oct. 21st.
leave bright trails that remain in the sky for a few seconds or more, but most appear as just faint streaks. So, if your sky is somewhat hazy, or there are bright lights in your vicinity, or if you're not alert, you won't see many. A few have noticeable colors, in part caused by the chemicals in them, but chiefly due to their speed as they move through the upper atmosphere.
The reason is that meteoroids are moving in all directions in space, but the Earth is moving around the sun in one direction, in essence like a very fast train, speeding at 18.5 miles per second. In the evening we're on the caboose of the train — looking backward. Unless a meteoroid was going at least as fast as the train, it would never catch up. Even fast meteoroids would seem to slow down, since you are moving away from them.
In the early hours of the morning, however, the situation is reversed. You're no longer in the caboose, but have now moved up front with the engineer — on the forward side of. Now, even a slow meteor seems to be moving rapidly, because Earth is whizzing toward it at the rate of 18.5 miles per second. The only meteoroids escaping collision are those ahead of the Earth moving in the same direction with velocities exceeding 18.5 miles per second.
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