As India entered the history books with insertion of its maiden Mars Orbiter Mission (MOM) into the Martian orbit early Wednesday, NASA's 2012 Mars mission Curiosity, ISRO's Mars Orbiter and NASA's 2014 Mars mission Maven that entered the Mars orbit Sep 21 exchanged fun tweets."The #MAVEN team congratulates @ISRO for its #Mars arrival! @MarsOrbiter joins the missions studying the Red Planet," read the tweet from Nasa's Mars Mission twitter handle @MAVEN2Mars.Curiosity Rover (@MarsCuriosity) welcomed it with a "Namaste"."Namaste, @MarsOrbiter! Congratulations to @ISRO and India's first interplanetary mission upon achieving Mars orbit," it tweeted.To this, ISRO's Mars Orbiter (@MarsOrbiter) replied: "Howdy @MarsCuriosity? Keep in touch. I'll be around."Later, ISRO's Mars Orbiter tweeted: "I'll be back after breakfast. Good ol' sunlight. It's good for your battery."