Dear apsirant,

As per as my observation is considered most of the research astronomers have their degree in physics /astronomy or master degree in physical science mainly physics or astronomy.

To be at that level it takes around 7-8 years beyond the school education. Astronomers are normally good with computers in programming and with normal usage. They also have good mathematical knowledge.

So, you can absolutely pursue astronomy after clearing your b.tech degree with decent percentage of marks. You can opt for specialisation in astrophysics /astronomy.