Tell about Curiosity Rover ?

Curiosity's Radiation Assessment Detector runs for 15 minutes every hour to measure a swath of radiation on the ground and in the atmosphere.

Gamma-rays or neutrons generated by this process can cause a risk to humans. Additionally, an ultraviolet sensor stuck on Curiosity's deck tracks radiation continuously.

In December 2013, NASA determined the radiation levels measured by Curiosity were manageable for a crewed Mars mission in the future.

In June 2017, NASA announced Curiosity had a new software upgrade that would allow it to pick targets by itself.

In early 2018, Curiosity sent back pictures of crystals that could have formed from ancient lakes on Mars. There are multiple hypotheses for these features, but one possibility is they formed after salts concentrated in an evaporating water lake.

Vapors from a "wet chemistry" experiment filled with a fluid called MTBSTFA (N-methyl-N-tert-butyldimethylsilyl-trifluoroacetamide) contaminated a gas-sniffing analysis instrument shortly after Curiosity landed.

Curiosity had a dangerous computer glitch just six months after landing that put the rover within only an hour of losing contact with Earth forever, NASA revealed in 2017.

That's the surprise we got back at the end of last year," said Jim Erickson, Curiosity project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, in a July 2014 interview.

Engineers had mechanical trouble with Curiosity's drill starting in ate 2016, when a motor linked with two stabilizing posts on the drill bit ceased working.

It should be noted that Curiosity isn't working alone on the Red Planet. Accompanying it is a "team" of other spacecraft from several countries, often working collaboratively to achieve science goals.

As of mid-2018, Curiosity is working on the surface along with another NASA rover called Opportunity, which has been roaming the surface since 2004.

It also found past evidence of water while exploring the plains and two large craters. NASA's Mars Odyssey acts as a communications relay for Curiosity and Opportunity, while also performing science of its own – such as searching for water ice.