After the success of Mangalyaan mission, now ISRO is preparing for Mangalyaan-2 mission. Mangalyaan was an orbiter mission, Mangalyaan-2 will also be an orbiter mission. This mission will be launched in 2024. That's why ISRO is taking so much time in Mangalyaan 2. Because before Mangalyaan-2 mission, ISRO is working to successfully launch Chandrayaan 3 which is a rover mission. If the chandrayaan-3 mission becomes successful, then with the experience of chandrayaan-3 mission, ISRO can also add a rover to the Mangalyaan 2 mission, which will land on Mars and collect information from it.