NASA is conducting research on various planets

NASA curiosity rover is doing research on mars

It was launched in 2011

It landed on mars on 5 august 2012

From that time it is sending pictures from mars

In one image a door is been seen of a cave on mars

On 7th may this pictures were officially shown

It seems that the cave is beautifully made by someone

But scientists don’t believe this

NASA has said , it’s a matter of point of view