### energy | radiation | light:

Meteor
* All meteors appear as brief streaks of light moving a short distance across the sky.
* Many meteors break apart, disperse or burn up in Earth's atmosphere
  - have persistent trains, and the brightest can cast a shadow on the ground
* Most meteors are a result of a passing comet.
* Most meteors are only about the size of a grain of sand, and burn up completely in the atmosphere
  - tiny specks of dust
  - particles the size of a grain and burn up quickly
  - small, about the size of sand grains
  - the size of a grain of sand and burn up in the atmosphere
  - tiny bits of dust that burn up high in the atmosphere
  - vaporized, but if they make it to the ground they are called meteorites
* Most meteors burn up and are vaporized before they reach the ground
  - never make it to the ground
  - before hitting the Earth
  - completely as they pass through our thick atmosphere
* Most meteors burn up in space before they reach the earth
  - the atmosphere before they can reach the ground
  - well above airline altitudes
  - come from comets
  - disintegrate completely many kilometers up in the atmosphere
  - enter atmospheres
* Most meteors glow for only a few seconds before they burn up
  - few seconds prior to burning up before hitting the Earth's surface
* Most meteors have blue color
  - never survive their fiery entries into the atmosphere
* Most meteors occur at time
  - in the region of the atmosphere called the thermosphere
  - originate from comets
  - result from meteoroids no more than a few centimeters in diameter
  - striking Earth burn up high in the atmosphere due to entry heating
  - vaporize in the energetic collision with the ground
* Some meteors are fragments of other planets, primarily Martian meteors
  - so tiny that they fall through the atmosphere without burning up
  - tens of meters in diameter
  - become so intensely heated that they appear as a fireball in the sky
  - fall to earth
  - occur in earth
  - produce dust
  - reach surfaces
  - strike earth
* appear as streaks of light zipping across the sky.
* appear in random spots in the sky and can go from horizon to horizon
  - the sky for only a second or two and range in brightness from very dim to extreme
* are actually chunks of rock and dust, left by passing comets
  - also easy to image
  - atmospheric
  - bits of space rock left in the wakes of passing comets
  - brief streaks of light that shoot across the sky
  - bright streaks of light seen briefly in the sky
  - companies
  - easier to see during the lower light conditions of night
  - examples of interplanetary objects that actually impact the earth
  - fragments of comets, planets, moons, or asteroids that have broken off
  - just small grains of interplanetary dust that enter the atmosphere at very high speeds
* are located in orbits
  - skies
  - solar systems
  - universes
  - longer-lasting warbling whistles
  - lumps of rock which are floating about in space
* are more common than comets
  - unpredictable in their appearance
  - mostly the debris from comets
  - natural things
  - part of meteor showers
  - particles the size of pebbles that have fallen off a comet
* are pieces of rock or ice colliding with the Earth's atmosphere at high speed
  - space debris that plow into the Earth's atmosphere
  - rocks in outer space that usually vaporize before reaching the Earth's surface
  - ships
  - simply bits of material that enter the Earth's atmosphere
* are small astro- nomical bodies that flash across the sky
  - pieces of rocky material left in the wakes of comets orbiting the sun
  - smaller in size
* are streaks of light in the sky
  - produced by meteorites entering the Earth's atmosphere
  - that flashes across the sky
* are the debris left in the wake of a passing comet
  - flashes of light that meteoroids produce when they enter the earth's atmosphere
  - left over debris from comets
* are the result of the Earth's atmosphere sweeping up small debris in space
  - very tiny particles, the debris from comets, which orbit the sun
* are tiny bits of dust that burn up in the Earth's upper atmosphere
  - rock, metals and gas left behind by passing comets
  - space debris that usually burn up completely in the Earth's atmosphere
  - usually particles which originate as small fragments given off by comets
  - very hard to record photographically
  - visible every clear night of the year
* associated with showers appear to originate from a spot in the sky.
* become meteorites if they reach the ground.
* blazing through the earth's atmosphere leave an ionized trail in the air over our heads.
* break up into smaller and smaller chunks in Earth's gravity.
* burn up in the mesosphere
  - when they hit the earth's atmosphere
* can appear anywhere in the sky at any time.
* can be difficult objects to see particularly if they are of the faint type
  - rocky, metallic, or a combination of both
  - sporadic, or they can occur in showers
  - occur at any time on any night and appear in any part of the sky
  - poke holes in solar panels, pit surfaces, and short out electronics
* constantly bombard the atmosphere leaving numerous ionized trails.
* continue to bombard the earth, but they are diminishing in both frequency and size.
* explode above the Pacific.
* fall into Earth's atmosphere over every spot on the planet.
* flare, the Milky Way glows, and geysers shoot up like silvery, vaporous ghosts.
* flash across the sky in a few seconds , while telescopes magnify a small part of the sky.
* get red-hot on reentry, where the surface both melts and oxidizes.
* happen all over the sky and they happen fast
  - when bits of rock, flying through space, burn up as they pass near the Earth
  - in fact nothing to do with stars
  - nothing to do with meteorites
* heat up quickly in the atmosphere because of friction with the air
  - the same way the space shuttle or other spacecraft do when they re-enter the Earth
* hit surfaces.
* includes photons
  - sections
* indicate processing of some comet dust during ejection.
* look like large sandstone rocks.
* mostly burn up in Earth's atmosphere.
* move very fast.
* natural object
  - fairly high up in the atmosphere
  - when small pieces of space stuff plow into the earth's atmosphere
* often occur in showers and swarms.
* only appear on clear nights as well, and are accompanied by a twinkling noise.
* rain down on the earth every hour of every day.
* seem to be fast moving streaks of light.
* streak across the roof of the sky.
* strike the thermosphere and mesosphere and burn from the heat generated by air friction.
* tend to move in the same direction of that of the earth and the planets
  - much faster after midnight
* travel small angular distances when near the radiant due to foreshortening.
* usually appear as brief streak of light in the atmosphere
  - break apart A faster meteor is more likely to break apart before it hits the ground
* usually last just a second or two
  - no more than a few tenths of a second
+ Meteor burst communication: Radio :: Meteorites
  * Meteors are lumps of rock which are floating about in space. They normally burn up in the atmosphere. A few very large ones that hit the earth are called 'meteorites'. Most meteors are only tiny specks of dust. As they enter the atmosphere they rip off electrons. This produces an ionized trail.
  * Meteors are lumps of rock which are floating about in space. They normally burn up in the atmosphere. A few very large ones that hit the earth are called 'meteorites'. Most meteors are only tiny specks of dust. As they enter the atmosphere they rip off electrons. This produces an ionized trail. This trail can reflect radio waves in the same way that a wire would.