NASA’s car-sized rover, Curiosity, has taken significant steps toward understanding how Mars may have lost much of its original atmosphere.
Read more about Curiosity by visiting https://www.nasa.gov/mission_pages/msl/news/msl20121102.html.
To learn about the engineering and challenges involved in getting Curiosity to Mars, check out four special Mars Month episodes of NASA Now on the NASA Explorer Schools Virtual Campus. Stream or download these videos from http://explorerschools.nasa.gov.
I have a doubt in Theory of relativity by Einstein
In this theory Einstein say that the light do not have mass
but if the light do not have mass how can it be attracted by a planet or a black hole?