|Globular Star Cluster Omega Centauri - Image courtesy: NASA|
The leading scientific magazine Physics World in its 25th anniversary issue has listed the following top five unanswered questions in physics.
- What is the nature of the dark universe?
- What exactly is time?
- Is life on Earth unique?
- Can we unify quantum mechanics and gravity?
- Can we exploit the weirdness of quantum mechanics?
Some of these eternal riddles might get resolved within the lifetime of current generation, while others may continue to haunt scientists in the centuries to come.
The question, I would like to know the answer to in my life-time, is about the rarity of life. According to the legendary science-fiction writer Arthur C Clarke "Two possibilities exist; either we are alone in the universe or we are not. Both are equally terrifying."
To me, both possibilities are equally exciting.