Theory:

Meaning of difficult words from the lesson "The Comet - II":
 
S.No
Words
Meaning
1.
Deliberation
Refers to a discussion or careful consideration
2.
Star-studded
Filled with stars
3.
Collision
Refers to a crash between two things
4.
Heading A direction or path which something moves
5.
Calamity A terrible event that causes lot of damage to lives and property 
6.
DispelTo get rid of something especially a feeling or belief
7.
AstronomerA scientist who studies the sun, moon, stars, planets, and other celestial bodies
8.
BunkerA strongly built underground shelter that gives protection during war
9.
PredictTo say something will happen in future
10.
GrazeTo touch something lightly while passing it
11.
RespiteA short break from something unpleasant
12.
DefensiveProtecting somebody or something from harm
13.
PropositionAn idea, plan, or a suggestion
14.
OffensiveUsed for the purpose of attack rather than defense
15.
DeflectTo change direction or making something change the direction after hitting something
16.
MammothVery large
17.
BrigadeGroup of people who are organised to do something
18.
PayloadThe amount of explosive that a spacecraft or satellite can carry
19.
Intercept
To stop somebody or somebody that is moving from one place to another 
20.
PreserveTo keep or maintain something safe
21.
ApproachA method of dealing with something
22.
DespatchTo send something to some place
23.
BrigadeA group of people working together to do something
24.
UnforeseenAn unexpected situation or a problem
25.
Rendezvous An arrangement to meet something at a particular place and time
26.
Detonation The action of causing an explosive to explode
27.
Massive
Very large or heavy
28.
Affinity
A close relationship between two people or things
29.
Observatory A building with a telescope or other equipment which astronomers use to observe stars, planets, weather, etc
30.
BombardTo attack a place with bombs or guns
31.
Pandal (Indian word)
A temporary shed used for ceremonies
32.
Obvious
In a way that can be easily seen or understood
33.
Yajna (Hindi word)Refers to a Hindu ritual done in front of a sacred-fire
34.
ShoreA land at the edge of lake, river or ocean
35.
TabooNot accepted as correct
36.
RitualA ceremony which is performed in the same way always
37.
PacifyTo make someone calm
38.
Blew upTo suddenly become angry and shout at someone
39.
CorrelationConnection between two things
40.
FutileUseless
41.
InterjectTo interrupt with an opinion or remark when someone speaks
42.
Correspondence The activity of writing letters
43.
SubtleNot very clear or noticeable
44.
Threat A possibility of danger or harm
45.
ChargeA violent attack
46.
Rendezvous  A meeting place
47.
Detonation An act of making an explosive device to explode
48.
LethargyThe state of having no energy or zest for doing things
49.
SoleOnly or single
50.
Annihilation
The state of being completely destroyed
51.
Avert
To prevent something bad or dangerous from happening
52.
Cautious
Being careful in order to avoid danger
53.
Triumph
A great success
54.
Deputise To act as a substitute
55.
Contemporary
Belonging to the same time
56.
Privileged
Having special rights or advantages that some people do not have
57.
SinisterSeeming evil or dangerous