Comets asteroids and meteors
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COMETS, ASTEROIDS AND METEORS. DIFFERENCES AND SIMILARITIES. COMETS. Icy object in space Rocky composition Remnants of solar system formation Progress slowly across the sky Reflect sunlight Can measure km’s in diameter Orbit the sun in elliptical orbits

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COMETS, ASTEROIDS AND METEORS

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Comets asteroids and meteors

COMETS, ASTEROIDS AND METEORS

DIFFERENCES AND SIMILARITIES


Comets

COMETS

  • Icy object in space

  • Rocky composition

  • Remnants of solar system

    formation

  • Progress slowly across

    the sky

  • Reflect sunlight

  • Can measure km’s in diameter

  • Orbit the sun in elliptical orbits

  • Tail always points away from the sun

  • Meteor showers caused by Earth passing through debris paths of comets

  • http://www.youtube.com/watch?v=29byorgwMGY


Asteroids

ASTEROIDS

  • Rocky composition

  • Most found in Asteroid Belt that orbits the sun between Mars and Jupiter

  • Most are less than a km in diameter

  • When pieces break off they become meteors

  • Have slightly elliptical orbits

  • Progress slowly across

    the sky


Meteors

Meteors

  • Most are less than 100 m in diameter

  • Most are fragments of large asteroids

  • Also known as “shooting stars”

  • Streak across the sky very fast

  • Remnants of the formation of the solar system

  • Rocky composition

  • Most burn up as they enter the atmosphere

  • Meteor showers caused by Earth passing through debris paths of comets


The difference between meteroids meteors and meteorites

The Difference between Meteroids, Meteors and Meteorites

Meteoroids are rocky bodies outside of Earth’s atmosphere

Meteors are fragments of a meteoroid that breaks up on impact with our atmosphere with a fiery flash

Meteorites are the rocky remains that fall to the surface of the Earth that survive the impact with Earth’s atmosphere


Impacts with earth

IMPACTS WITH EARTH

  • When comets or meteors make impact with a planetary object like earth they can leave a huge crater impression in the surface.

  • Extreme heat is created at impact and Earth’s surface rocks often get fused and transformed by the heat and pressure created

  • Some impacts have had devastating consequences for life on Earth


Examples of impact craters on earth

Examples of Impact Craters on Earth


Map of impacts with earth

Map of Impacts with Earth


1 vredefort crater

1. Vredefort Crater

  • Asteroid impact date: Estimated 2 billion years agoLocation: Free State, South Africa

  • Details: Also known as the

    VredefortDome, the

    Vredefortcrater has an

    estimated radius of 118 miles

    (190 kilometers), making it the world's largest known impact structure. This crater was declared a UNESCO World Heritage Site in 2005.


2 sudbury basin

2. Sudbury Basin

  • Asteroid impact date: Estimated 1.8 billion years ago

  • Location: Ontario, Canada

  • Specs: The Sudbury Basin is considered one of largest impact structures on Earth, with an estimated diameter of 81 miles (130 kilometers). Dating back 1.8 billion years, it is also one of the oldest known impact structures in the world.


3 acraman crater

3. Acraman Crater

  • Asteroid impact date: Estimated 580 million years ago

  • Location: South Australia, Australia

  • Specs: Located in what is

    now Lake Acraman, this

    impact structure has an

    estimated diameter of 56 miles

    (90 kilometers).


4 woodleigh crater

4. Woodleigh Crater

  • Asteroid impact date: Estimated 364 million years ago

  • Location: Western

  • Australia, Australia

  • Specs: This crater is not

    exposed at the surface

    and has led to many

    discrepancies regarding

    its actual size. Reports on

    its diameter vary from

    25 to 75 miles

    (40 to 120 kilometers).


5 manicouagan crater

5. Manicouagan Crater

  • Asteroid impact date: Estimated 215 million years ago

  • Location: Quebec, Canada

  • Specs: This impact crater formed what is now Lake Manicouagan.

    Even with erosion, it's

    considered one of the

    largest and best-preserved

    craters on Earth, with an

    estimated diameter of

    62 miles (100 kilometers).


6 morokweng crater

6. Morokweng Crater

  • Asteroid impact date: Estimated 145 million years ago

  • Location: North West, South Africa

  • Specs: Located near the Kalahari Desert in South Africa, this crater contained the fossilized remains of the meteorite that created it.


7 kara crater

7. Kara Crater

  • Asteroid impact date: Estimated 70.3 million years ago

  • Location: Nenetsia, Russia

  • Specs: Now greatly eroded, the Kara crater is a non-exposed impact structure in Russia. Some have claimed that the

    impact structure actually

    consists of two adjacent

    craters: the Kara and the

    Ust-Kara crater.


8 chicxulub crater

8. Chicxulub Crater

  • Asteroid impact date: Estimated 65 million years ago

  • Location: Yucatán, Mexico

  • Specs: Located on the Yucatán Peninsula in Mexico, many scientists believe that the meteorite that left this crater caused or contributed to the extinction of the dinosaurs. Estimates of its actual diameter range from 106 to a whooping 186 miles (170 to 300 kilometers), which if proved right could mean it's the biggest.


9 popigai crater

9. Popigai Crater

  • Asteroid impact date: Estimated 35.7 million years ago

  • Location: Siberia, Russia

  • Specs: Russian scientists

    claim that this crater site

    contains trillions of carats of

    diamonds,

    making it one of the largest

    diamond deposits in the

    world. These diamonds

    have been referred to as

    "impact diamonds."


10 chesapeake bay crater

10. Chesapeake Bay Crater

  • Asteroid impact date: Estimated 35 million years ago

  • Location: Virginia, United States

  • Specs: Discovered in the early 1980s, the Chesapeake Bay Crater

    is located approximately

    125 miles (201 kilometers)

    from Washington, D.C.

    Some estimates suggest

    this crater is 53 miles

    (85 kilometers) wide.


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