Every year. There are also several other yearly showers in the link below. Besides which, there are many man-made objects that reenter the atmosphere, and many unique objects that surprise us.
The Leonid meteor shower, often just called the Leonids, occur in November of every year.
All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.All meteor showers occur at the same time every year. For example, the Leonids are always in November and the Perseids are always in August. The same applies to all of the other meteor showers. This is because Earth takes the same path on its orbit each year, and so it passes through the same regions in space where the meteor showers happen.
As comets orbit the sun, they leave a trail of debris behind them, tracing out their orbit. If the earth's orbit intersects the comet's orbit, some of that debris enters the earth's atmosphere and 'burns up' to give a meteor shower. Meteor showers therefore occur around the same time every year (e.g., the Perseids in August, or the Leonids in December), as the earth reaches the same point in its orbit around the sun (i.e., the point where it intersects the meteoroid stream). They don't occur "once every few years" (and i don't understand what you mean by "why not twice?" - why not what?)
Meteor showers occur when a meteor comes too close to the earth and gets drawn in by the earth's gravity. The light you see trailing behind the meteor (shooting star) is Ice melting off of it from the sun's heat.
They appear when Earth passes through a dirty part of space, usually through the trail left by a comet. There are particular times of year as we orbit the Sun that we pass through these areas of space. The Perseid Meteor Shower occurs in August, for example. The Leonids occur in November. They usually have a peak night, but you will see meteors on other nights around the peak. Some meteor showers are better than others and factors like weather and what phase the Moon is at will influence how much you can see and how bright some of the meteors will appear to be. Check the link below for a list of meteor showers and when the happen.
Rivers and streams occur in every climate in the world.
Probably the best are the Perseids, which occur in August. Every 33 years, the Leonids of November are potentially great, although 1999 was a disappointment. In general, all showers are best seen after midnight, when the Earth is turned "forward" in its orbit and is therefore "heading into" the debris field of the meteoroids.
You can see a meteor when a piece of ice, dust, dirt or rock burns up in the atmosphere in the night sky. That can happen on any night, but on an ordinary night you won't see many. At certain times of year there is increased activity when we have meteor showers, giving you a chance to see more of them. Some regular periods of highest meteor activity are named for the astrological constellations in the part of the sky in which they appear to occur. Some of these are: Quadrantids (January) Lyrids (April) Eta Aquarids (May) Perseids (August) Orionids (October) Leonids (November) Geminids (December)
They occur at the boundaries between the first, second, and third wind systems
Lyrids- Appears on approximately April 21st Perseids- Appears on approximately August 12th Orionids- Appears on approximately October 20th Taurids- Appears on approximately November 4th Leonids- Appears on approximately November 16th Geminids- Appears on approximately December 13th
It's less of of a "where" and more of a "when". There are meteor showers through the year and you stand a good chance of seeing them, providing it is clear, dark and, ideally, a new moon. The most famous are probably the Perseids which occur in mid-August.
A meteor "outburst" is an unexpected, generally fairly intense, meteor shower. They are probably associated with extinct comets, but we don't know what the origin is. Meteor "showers" occur when the Earth passes through the debris path left in the orbit of extinct or decaying comets. There are more than a dozen fairly predictable meteor showers, which are generally identified by the name of the astronomical constellation from which the meteors "appear to" radiate. For example, there's a pretty broad band of dust and pebbles that cross the Earth's orbit in early-to-mid August which come from the direction of the constellation Perseus; we call these the "Perseids", and are generally best seen between August 10 and August 13 each year.