It is not possible to send MOM (mars orbiter mission) or Mangalyaan space craft without the help of computers.
The various calculations cannot be done by people manually to the precision required. Complicated
structure can't be built. To design the space craft shape we need to
use automatic super computers to solve many equations and come up with precise
To test the space craft and its electronics, we need computers and
programs to automatically test it in a simulated environment. This cannot
be done manually.
However, there are many quick reports and anomalies that are pointed out
by sensors on the space craft. These are collected and suitably presented
by computer programs. The solutions given by scientists are converted
into actions on various motors through transducers and physical control on
space craft is achieved. It is impossible to control mechanically with
out electronics and fast and small digital computers.
It is impossible to manually collect and analyze the data collected by sensors
on MOM. There are millions of pieces of information received every minute
and these are to be analyzed to take quick decisions in minutes.
Automatically programmed small computer on MOM will act according to the
situation it faces. Manually it is very difficult to handle the
operations on board MOM.
Computer helps us to test MOM's correct functioning by some simulated tests. That will be difficult manually.