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Chapter 17: Problem 29

When is a meteoroid termed a meteor? When is it termed a meteorite?

Short Answer

Expert verified
A meteoroid becomes a meteor when it enters Earth's atmosphere; it becomes a meteorite if it reaches the ground.

Step by step solution

01

Understanding Meteoroids

A meteoroid is a small rocky or metallic body traveling through outer space. Meteoroids can vary in size from small grains to one-meter-wide objects. They are often fragments of comets or asteroids.
02

Defining Meteor

When a meteoroid enters Earth's atmosphere, it begins to burn due to friction with air molecules. This burning meteoroid creates a bright streak in the sky called a meteor, often referred to as a shooting star.
03

Concept of Meteorite

If the meteoroid survives its passage through the atmosphere and hits the Earth's surface, it is called a meteorite. Meteorites can range in size from tiny particles to large, substantial masses.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Meteor
A meteor is often mistaken for a shooting star due to its bright trail in the night sky. This dazzling phenomenon occurs when a meteoroid enters the Earth's atmosphere. As it plunges through the air, it encounters increasing resistance from the air molecules. This resistance creates intense friction and heat, causing the meteoroid to glow brightly. The meteor's journey through the atmosphere is normally brief, lasting only a few seconds. However, it creates a lasting impression as a spectacular streak of light across the sky.

Key points to remember about meteors:
  • Meteors are not stars, despite being called shooting stars.
  • The light trail is due to frictional heating in the atmosphere.
  • Meteors are mostly visible during meteor showers, which occur when the Earth passes through a debris field left by comets.
Meteorite
Meteorites provide a tangible connection between Earth and outer space. When a meteoroid survives its fiery journey through the Earth's atmosphere and lands on the surface, it becomes known as a meteorite. Due to their exposure to immense heat and pressure during their descent, meteorites often have a burnt crust and can vary widely in composition, ranging from metallic to stony.

Important aspects of meteorites include:
  • Most meteorites are fragments of asteroids, but they can also originate from comets and, in rare cases, other planets or moons.
  • Meteorites are categorized into three main types: stony, iron, and stony-iron.
  • Despite being rare, meteorites offer crucial clues about our solar system's formation and the history of the cosmos.
Atmosphere
The Earth's atmosphere plays a pivotal role in the transformation of meteoroids into meteors and meteorites. Composed of layers of gases, it acts as a protective shield against potential impacts from outer space objects. As meteoroids travel through the atmosphere, they encounter strong resistance from air molecules. This resistance causes the meteoroids to heat up and burn, creating the bright pheno-menon we observe as a meteor.

Key functions of the atmosphere related to meteors and meteorites include:
  • The atmosphere protects the Earth by burning up most meteoroids before they reach the surface.
  • It acts as a filter, ensuring only the largest or densest meteoroids become meteorites.
  • The temperature and density of the atmosphere affect how a meteoroid behaves as it travels through it.
Understanding these roles highlights the importance of the atmosphere in shielding Earth from potential extraterrestrial impacts.

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