• Save
Asteroid and d.l
Upcoming SlideShare
Loading in...5
×
 

Asteroid and d.l

on

  • 370 views

 

Statistics

Views

Total Views
370
Views on SlideShare
370
Embed Views
0

Actions

Likes
0
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Asteroid and d.l Asteroid and d.l Presentation Transcript

  • NAME- BHARAT AGGARWALCLASS- 8TH BROLL- 16SUBJECT OF PRESENTATION- ASTEROIDS AND COMETS
  • Today I am going to tell you about asteroids and comets.They are generally large floating stones in a particular path Lets learn a little bit about them
  • By bharat aggarwal
  • 1. Small objects in the solar system are leftovers that never accreted into planets2. Minor planets mostly orbit between Mars and Jupiter3. Comets formed in the outer solar system and were flung outward by close encounters with other planets4. Comets can be trapped in the inner solar system by planetary encounters5. The head and tail of a comet glow from sunlight shining on gases evaporated from the comet6. Meteors and meteorites are pieces broken off larger bodies by collisions, or dust shed by comets7. Occasionally comets or minor planets collide with larger objects like the earth
  •  Asteroids: within the orbit of Jupiter Centaurs: Between Jupiter and Neptune Kuiper Belt Objects (KBO’s): Beyond Neptune Scattered Disk: Extreme KBO’s Comets: Icy bodies with elongated orbits Meteoroids: Small objects  Meteors: vaporize in Earth’s atmosphere  Meteorites: survive to reach surface 1. Small objects in the solar system are leftovers that never accreted into planets
  •  Vulcan  Hypothetical planet within the orbit of Mercury  Some asteroids and many comets cross the orbit of Mercury, but nothing is known to orbit entirely within the orbit of Mercury Planet X  Hypothetical massive outer planet beyond Neptune Nemesis  Hypothetical dwarf star companion to Sun
  • Asteroid
  •  Asteroid are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones. These terms have historically been applied to any astronomical object orbiting the Sun that did not show the disk of a planet and was not observed to have the characteristics of an active comet, but as small objects in the outer Solar System were discovered, their volatile-based surfaces were found to more closely resemble comets, and so were often distinguished from traditional asteroids. Thus the term asteroid has come increasingly to refer specifically to the small bodies of the inner Solar System out to the orbit of Jupiter, which are usually rocky or metallic. They are grouped with the outer bodies—centaurs, Neptune Trojans, and trans-Neptunian objects—as minor planets, which is the term preferred in astronomical circles. This article will restrict the use of the term asteroid to the minor planets of the inner Solar System.
  • Asteroids Year1 1801100 1867500 19021,000 19212,000 19425,000 197210,000 198120,000 199350,000 1999100,000 2000200,000 2003 2. Minor planets mostly orbit between Mars and Jupiter
  •  535789 Minor planets catalogued 251651 Officially numbered 16154 Named 2. Minor planets mostly orbit between Mars and Jupiter
  •  Spacecraft Ground-Based and Hubble Imaging Radar Imaging 2. Minor planets mostly orbit between Mars and Jupiter
  • 2. Minor planets mostly orbit between Mars and Jupiter
  • 2. Minor planets mostly orbit between Mars and Jupiter
  • 2. Minor planets mostly orbit between Mars and Jupiter
  • 2. Minor planets mostly orbit between Mars and Jupiter
  • 3. Comets formed in the outer solar system and were flung outward by close encounters with other planets
  • A comet is an icy small solar system body(SSSB)that, when close enough to the sun, displays a visiblecoma(a thin, fuzzy, temporary atmosphere) andsometimes also a tail. These phenomena are both dueto the effects of solar radiation and the solar windupon the nucleus of the comet. Comet nuclei rangefrom a few hundred meters to tens of kilometersacross and are composed of loose collections of ice,dust, and small rocky particles. Comets have beenobserved since ancient times and have traditionallybeen considered bad omens.
  •  Short Period (<200 years) Record reobserved comet is Comet Ikeya-Zhang Long Period (>200 years)  Hale-Bopp (2400 years)  Need a source very far away  Oort Cloud  Too little material very far from the Sun  Flung out by planetary encounters 3. Comets formed in the outer solar system and were flung outward by close encounters with other planets
  •  Ice and Frozen Gases  Outer Solar System (Kuiper Belt) Planetary Encounters perturb Orbits  Diverted inward to become short-period  Diverted outward to Oort Cloud 3. Comets formed in the outer solar system and were flung outward by close encounters with other planets
  • 3. Comets formed in the outer solar systemand were flung outward by close encounters with other planets
  • 4. Comets can be trapped in the inner solar system by planetary encounters
  •  Most-observed comet in history Discovered the furthest from the Sun Largest cometary nucleus known Visible to the naked eye for 18 months – twice the previous record Brighter than magnitude 0 for eight weeks, longer than any other comet in the last thousand years. 5. The head and tail of a comet glow from sunlight shining on gases evaporated from the comet
  • 5. The head and tail of a comet glow from sunlight shining on gases evaporated from the comet
  • 5. The head and tail of a comet glow fromsunlight shining on gases evaporated from the comet