I think that looking for an asteroid in deep space is like looking for a pin in a haystack. They are incredibly difficult to see as there is just so much space to look at. We have limited telescopes and facilities to track. When we do have telescopes, science wants to use them for other reasons.

It is inevitable though that we will be hit by something at some point which will really damage our planet. That could be thousands or millions of years away. Probability says not to worry too much.

Could we do anything? I am not sure whether our existing technology can do much. Nuclear weapons seem like the best option. However, hopefully, one day we can develop better technology to protect us and better technology to prevent them.

Until then, hopefully probability will protect us.

Nice post @gbenga - upvoted