According to universal theory Big bang happened 20 billion years ago.

Most people put it around 12-15 Billion years ago. Depends on what value of the Hubble variable ^H^H^H^H^H constant.

Galaxy far way from these have been found.

No Galaxy has been found with a redshift larger than the age of the Universe, none whatsoever. In fact, if we found a Galaxy older than 15 Billion Years it puts a constraint on the age of the Universe. A few stars have been observed with a calculated age larger than the age of the Universe. That only says our models are not accurate yet. But we knew that.

Also what about Sound frequencies after the blast they to travel far slower then light. we should be also able to catch those.Any takers.

Bwahaha. Troll.

Yelmalio - In space no one can hear you scream.