NASA's Mars Curiosity rover is working on its mission to find out about life supporting clues. It seems that with passage of time, their research has been getting difficult.

It has been said so as a big amount of water and a chemical has been found on the red planet. Experts were of the view that the revelation will surely make things more complicated.

Study researchers were of the view that in addition to water, some of the other things that sands of Mars contain are sulphur dioxide and carbon dioxide.

Not only Curiosity rover but NASA's Phoenix lander which is now no more functional has also found certain new things on Mars. One of the things that have been found is perchlorate.

In fact, Curiosity rover has also found a penny. Experts were of the view that penny is over 100 years old. It was in 2012 that Curiosity rover sent back the picture of the penny on the Earth. Curiosity rover's MAHLI camera was the one, which has taken the photograph of the penny.

The penny is having in the initials of VDB, which is of Victor David Brenner. He was the person, who has designed the Lincoln penny on Lincoln's 100th birthday.