Ceres is the largest asteroid with a diameter of 1003 km. Comets revolve around the sun, and their tails always point away from the sun as they approach it. A comet does not increase in size as it moves away from the sun. Halley's comet has a periodic orbit of 76 years and was discovered by Edmund Halley in 1705. It last appeared in 1986 and will next appear in 2062. Comets have more than one tail. Asteroids are rocks that lie in space.

2. Which is the largest asteroid & what is it diameter?
C e r e s , 1 0 0 3 k m
Comets revolve around whom?
s u n
To which direction does the tail of a comet points when it approaches the
sun?
I t p o i n t s a w a y f r o m t h e s u n
Does a comet size increase as it moves away from the sun?
N o
What is the time period of Halley’s comet?
76 years
Who discovered Halley's comet ?
E d m u n d H a l l e y
In which year Halley's comet appeared last?
I n 1 9 8 6
In which year Halley's comet will again appear?
In 2062
Does a comet have more than a tail?
y e s

3. The rock that lie in the space?
A s t e r o i d s
Name the level of earth atmosphere, where most part of the meteor gets
burn away?
M e s o s p h e r e
Name one crater formed by a meteorite?
T h e b a r r i n g e r c r a t e r i n A r i z o n a
Name worlds first artificial satellite & when did it sent to space?
S p u t n i k - I , O c t o b e r / 4 / 1 9 5 7
Name the first satellite launched by America ?
V a n g a r d - I ( 1 9 5 8 )
When did the first Indian satellite launched?
O n m a r c h 1 9 7 5 ( a r y b h a t t a )
Which satellite was renamed after kalpana chawla?
M e t s a t ( 1 2 S e p t e m b e r 2 0 0 2 )
What you mean by remote sensing?
I t m e a n s c o l l e c t i n g i n f o r m a t i o n f r o m a
d i s t a n c e . i t i s u s e d f o r l o c a t i n g m i n e r a l s &
s t u d y i n g a g r i c u l t u r a l y i e l d .
Who termed the idea of Big Bang?
G e o r g e r L e m a i t r e