18 Puranas and 18 sub sets (Upa Puranas)
18 puranas 1,180 upanishaths
There are many Puranas and there are even new ones being created to this day. However, there are about 19 main ones about to the main Hindu deities like Agni, Vayu, Vishnu, Shiva and Brahma. The Bhagavad Purana is about Krishna. There are also Puranas about Vishnu's avatars (like the Matsya Purana).
There are 18 Puranas & 11 main Upanishads , but there are more smaller Upanishads which are 108 in number . Some also say that they are more Than 200 . :/
Mahabharata & Ramayan are epic poems of Hinduism. While puranas are description of Vedas.
The Puranas are a collection of Hindu scriptures which glorify particular deities by listing their special qualities and supernatural feats. In some instances it is suggested that the Puranas were created to provide support for the Vedas.
Both Brahma and Shiva were created by Vishnu - according to many Vedas/Puranas
there are 6 holy books they are the vedas the upanisads the smrutis the ramayana the mahabharata annd the puranas
Vedas, Upanishads, Puranas
I am not aware of any astronomical object called "Puranas". Perhaps you may want to check the spelling, or otherwise clarify what you are talking about.
4 Vedas Mahabharata Ramayan and Puranas. Apart from that many Aryans Scriptures and Sacred Texts are there.