Asteroids NEAR EARTH OBJECTS NEOS COMETS METEORS AND

Asteroids

NEAR EARTH OBJECTS (NEOS): COMETS, METEORS, AND ASTEROIDS CHARACTERISTICS, COMPOSITION, & LOCATION S 6 E 1 E. ASK QUESTIONS TO COMPARE AND CONTRAST THE CHARACTERISTICS, COMPOSITION, AND LOCATION OF COMETS, ASTEROIDS, AND METEOROIDS.

CHARACTERISTICS - ASTEROIDS • SMALL, IRREGULAR SHAPED OBJECT THAT ORBITS THE SUN • BELIEVED TO BE LEFT-OVER PIECES OFPLANETS AND MOONS

Asteroids, are “space rocks” that are too small and too numerous to be considered fullfledged planets. Asteroids visited by spacecraft. Some can reach to over 250 km across

COMPOSITION - ASTEROIDS • HUGE CHUNKS OF ROCK AND METAL (IRON AND NICKEL)

LOCATION/ORIGIN - ASTEROIDS • BETWEEN MARS AND JUPITER IN THE ASTEROID BELT

CHARACTERISTICS - COMETS • SOMETIMES CALLED “DIRTY SNOWBALLS” • WHEN CLOSE TO THE SUN, ICE VAPORIZES, PRODUCING A SPECTACULAR STREAK OF GAS, REFERRED TO AS A TAIL “ ” • THE TAIL IS VISIBLE FORSEVERAL NIGHTS AND STAYS IN THE SAME PLACE RELATIVE TO THE BACKGROUND STARS AT NIGHT • MANY TRAVEL IN A HIGHLY ELLIPTICAL ORBIT AROUND THE SUN

COMPOSITION - COMETS • BODIES IN SPACE MADE UP OF ICE, DUST, ROCK, AND FROZEN GASES

LOCATION/ORIGIN - COMETS • OORT CLOUD (JUST PAST THE OUTSIDE EDGE OF THE SOLAR SYSTEM) - LONG PERIOD COMETS • KUIPER BELT – (JUST PAST NEPTUNE) – SHORT PERIOD COMETS

METEORITE, METEOROID, METEOR? WHAT’S THE DIFFERENCE?

CHARACTERISTICS - METEROIDS • SAND GRAIN TO BOULDERSIZED • A METEOROID IS A CHUNK OF ROCK OR DUST IN SPACE. METEOROIDS USUALLY COME FROM COMETS OR ASTEROIDS.

COMPOSITION – METEROIDS • SMALL, ROCKY

LOCATION/ORIGIN- METEROIDS • SPACE

CHARACTERISTICS - METEORS • METEOR IS A STREAK OF LIGHT THAT LASTS FOR A FEW SECONDS WHEN A METEROID BURNS UP IN THE EARTH’S ATMOSPHERE • “SHOOTING STAR”

So, a Meteor is a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere.

LOCATION/ORIGIN- METEORITE • A METEORITE THAT HAS PASSED THROUGH THE EARTH’S ATMOSPHERE and HITS THE EARTH’S SURFACE.

CHARACTERISTICS - METEORITES • A METEORITE THAT HAS PASSED THROUGH THE ATMOSPHERE AND HITS EARTH’S SURFACE

COMPOSITION - METEORITES 3 TYPES: • STONY • IRON • STONY-IRON (P. 99 IN YOUR WORKTEXT)

Review • Q: What is the difference between a meteoroid, meteor, and a meteorite? • Meteoroid = in space, smaller than an asteroid • Meteor = enters Earth’s atmosphere; “Shooting Star” • Meteorite = a small rock or rocky grain that strikes Earth’s surface

Review • Q: What is the difference between an asteroid and a meteoroid? • The main difference is the size of the object. • Q: Which is larger, asteroid or meteoroid? • Asteroids are larger than meteoroids.

Review • Bright streaks of light that result when rocky bodies burn up in the atmosphere are called ______. • Frozen bodies made of ice, rock, and dust, sometimes called “dirty snowballs” are called _______. • Small, rocky bodies that revolve around the sun are called _______.

Review • Bright streaks of light that result when rocky bodies burn up in the atmosphere are called meteors. • Frozen bodies made of ice, rock, and dust, sometimes called “dirty snowballs” are called comets. • Small, rocky bodies that revolve around the sun are called asteroids.