HI,
see when we start a bachelor course after 10+2 we just start from the initial step, it is not only you who do not have the depth knowledge, no one knows in depth about any career line, when starts a new journey of education. see astronomy is related with physics and mathematics, it involves the studies of space, gravitational energy, phenomena occurs in the atmosphere etc. so if you are really interested in this things than you should go for it.
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