The curiosity about extra-terrestrial (ET) life was age-old, and had stirred the human imagination for long thanks to old folk tales and the modern science fiction films; but the time had come to demystify the mystery, Narlikar said.
He said this while delivering the 22nd Dr Yelavarthy Nayudamma Memorial Lecture on 'Are we alone in the universe?' after receiving the Nayudamma Memorial Award here on Saturday.
The study of bacterium found high above the earth's surface may yield answer to this question in the near future, he said.
But this method, which relies on the extra terrestrial life forms -- if they exist -- understanding and replying to the message, needs huge patience, as the reply would take decades to reach back here, he said.
More From This Section
The second approach, Dr Narlikar said, involved searching for life in a microbial form, right at the earth's doorstep.
"The riddle was: Do cells, bacteria and viruses exist at heights of 40-50 km above the earth's surface?" he said.