1. COMET-1&2

2. SUMMARY
Duttada, an amateur scientist, can’t stay away from the keen eyed Dibya Chakshu ( his telescope) for long.
Duttada's secret ambition was to discover a new Comet
One night, Duttada detects a new comet.
Thereafter it is named after the discoverer as the ‘’Comet Dutta’’.
Indian Institute of Astrophysics conforms his findings.
His wife Indrani Debi, wishes he hadn’t found the comet.
A British scientist writes a paper based on Duttada’s discovery.
A conference of international experts is convened to yield a clue to the cosmic puzzle.
Duttada and the British defence Science Advisor have a meeting over the impending calamity.
The problem was that the Comet Dutta was to collide with the earth.

3. SUMMARY
The experts calculated that the bulk of destructive nuclear power available on earth would be needed to achieve this mammoth task.
The project ‘’LIGTH BRIGADE’’ was the name of the space mission to stop Comet Dutta from collision with the earth.
Duttada returns home to a warm welcome and a ceremony.
On November 18 Duttada receives a secret message, indicating the success of the mission and then he rushes to the sweet shop.
On 15 December the Comet Dutta passes the earth at a distance of 80,000 km.
Duttada believed in scientific logic but there are many people who believe in superstition.
His wife believed in superstition and concluded the collision was avoided because of the ‘yagna’ perfomed by her grandson.

4. JAYANT NARLIKAR An Indian astrophysicist
A proponent of steady state cosmology
He developed with Sir Fred Hoyle the conformal gravity theory, commonly known as Hoyle–Narlikar theory
Born: July 19, 1938, Kolhapur
Education: Banaras Hindu University, University of Cambridge
Awards: Padma Bhushan, Padma Vibhushan
In joined Institute of Theoretical Astronomy in Cambridge University
In 1972 joined as professor of Theoretical physics at the Tata institute of Fundamental Research, Mumbai
In 1989 took charge as Founder-Director of Inter university centre for astronomy & astrophysics (IUCAA), Pune

5. COMET Comets are small icy bodies Travel past the Sun
Give off gas and dust as they pass by
Comets have a nucleus, coma and tail
Nucleus (very small, about 10 km across) rock & ices (mostly H2O and CO2 [dry ice], some methane CH4 & ammonia NH3)
Coma (103 to 105 km in diameter) is gaseous & is a cloud of evaporated ices and ions. As comet approaches Sun ices sublime, change from solid to gas, dust grains loosen and move away
Tails (105 km to 1 AU long), always points away from the Sun. Solar wind (steady stream of solar particles) pushes gas away; dust continues to orbit Sun.

6. HALLEY’S COMET
PARTS OF A COMET

7. ASTEROIDS Small bodies
Believed to be left over from the beginning of the solar system billions of years ago
100,000 asteroids lie in the asteroid belt between Mars and Jupiter
Largest asteroids have been given names
Asteroids show up as streaks on photos
Since they orbit the Sun, they are observed to move with respect to the stars
Asteroids are typically cratered and irregularly shaped
Composition of Asteriods are:
Carbonaceous—containing carbon
Rocky—mostly silicates
Metallic—iron and nickel rich

8. ASTEROID ida & Ida's moon, Dactyl

9. METEORS Asteroids show up as streaks on photos
Meteors burn up in the atmosphere; meteorites don’t; impacts can and do happen
Meteor Crater, Arizona
50,000 years old
Projectile was 50 meter diameter, metallic asteroid
Crater diameter is 1.2 km, 200 m deep

10. Carbonaceous Chondrite
SPORADIC METEORS
Stony-Irons
Irons
Chondrites
Carbonaceous Chondrite
Achondrite

11. Barringer’s Crater
An iron meteorite 100 feet across and 70,000 tons slammed into the Earth at about 43,000mph in the Arizona desert near Flagstaff 40,000 years ago.
Barringer Crater is 4,100 feet wide and 571 feet deep.

12. MILKYWAY GALAXY
Our Galaxy is a collection of stellar and interstellar matter – stars, gas, dust, neutron stars, black holes – held together by gravity.
1610 -Galileo discovered the Milky Way is comprised of many stars

13. SOLAR SYSTEM Our solar system is made up of: Sun Nine planets
Their moons
Asteroids
Comets

14. Inner Planets
The inner four rocky planets at the center of the solar system are:
Mercury
Venus
Earth
Mars

15. Outer Planets The outer planets composed of gas are : Jupiter Saturn
Uranus
Neptune

16. SOLAR SYSTEM

17. HUBBLE TELESCOPE Orbit height: 569 km Launch date: April 24, 1990
The Hubble Space Telescope is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation
Orbit height: 569 km
Launch date: April 24, 1990
Speed on orbit: 7.5 km/s
Power: 2,800 watts

18. THANK YOU
DONE BY-
AAKRITI
SHAMUDA