it came from
DESCRIPTION
IT CAME FROM. OUTER SPACE. Asteroids, comets, and YOU. Formation of the Solar System. Formation of the Moon. Luna. The Asteroid Belt is not like this. Chicxulub 65 million years ago 180 km wide. Barringer Meteor Crater (Arizona) 49,000 years ago 1.186 km diameter (0.737 miles). - PowerPoint PPT PresentationTRANSCRIPT
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IT CAME FROM
Asteroids, comets, and YOU
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Formation of the Solar
System
![Page 3: IT CAME FROM](https://reader036.vdocument.in/reader036/viewer/2022062321/56813d61550346895da73258/html5/thumbnails/3.jpg)
Formation of the
Moon
![Page 4: IT CAME FROM](https://reader036.vdocument.in/reader036/viewer/2022062321/56813d61550346895da73258/html5/thumbnails/4.jpg)
Luna
![Page 5: IT CAME FROM](https://reader036.vdocument.in/reader036/viewer/2022062321/56813d61550346895da73258/html5/thumbnails/5.jpg)
The Asteroid Belt is not like
this
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Chicxulub
65 million years ago
180 km wide
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Barringer Meteor Crater (Arizona)
49,000 years ago
1.186 km diameter (0.737 miles)
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Area surrounding the 1908 Tunguska Event, circa 1927
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Artist’s Conception, just before impact
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When will the next collision occur?
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Asteroid 99942 Apophis
Size: 300 meters
Probabilty of Collision in 2036: 1 in 45,000
(as of last year)
2029 Orbit-changing encounter
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Factors important in asteroid collisionsPlanetary
Gravity gplanet =
9.8 m/s
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Target DensityRocky Crust: ρ = 2700 kg/m3
(Water: ρ = 1000 kg/m3)
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Impactor DensityDensity: ρ = 3000 kg/m3 maxComet: ρ = 300-700 kg/m3
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Kinetic EnergyKE = ½mv2
vmeteor = 10 - 40 km/s (assume 30)
Angle of ImpactMost common: 45°
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Equation for Radius of Impactorfrom De Pater and Lissauer (2001)
Rmeteor
=
0.401 (ρplanet)0.4
2
(Dcrater)1.2
8(vmeteor)0.5
6
(gplanet)0.2
8(ρmeteor)0.4
2
(2700)0.4
2
(9.805)0.
28(3000)0.4
2
(30000)0.
56
2.26×10-3