Question

What is universe ,

,? what is dark matter ,!? ​

Answer 1

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1. all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
2. in some cosmological theories) non-luminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles ( cold dark matter ) or high-energy randomly moving particles created soon after the Big Bang ( hot dark matter ).

Answer 2

• ᴛʜᴇ ᴜɴɪᴠᴇʀsᴇ ɪs ᴀʟʟ ᴏғ sᴘᴀᴄᴇ ᴀɴᴅ ᴛɪᴍᴇ ᴀɴᴅ ᴛʜᴇɪʀ ᴄᴏɴᴛᴇɴᴛs, ɪɴᴄʟᴜᴅɪɴɢ ᴘʟᴀɴᴇᴛs, sᴛᴀʀs, ɢᴀʟᴀxɪᴇs, ᴀɴᴅ ᴀʟʟ ᴏᴛʜᴇʀ ғᴏʀᴍs ᴏғ ᴍᴀᴛᴛᴇʀ ᴀɴᴅ ᴇɴᴇʀɢʏ.

• ᴅᴀʀᴋ ᴍᴀᴛᴛᴇʀ ɪs ᴀ ғᴏʀᴍ ᴏғ ᴍᴀᴛᴛᴇʀ ᴛʜᴏᴜɢʜᴛ ᴛᴏ ᴀᴄᴄᴏᴜɴᴛ ғᴏʀ ᴀᴘᴘʀᴏxɪᴍᴀᴛᴇʟʏ 85% ᴏғ ᴛʜᴇ ᴍᴀᴛᴛᴇʀ ɪɴ ᴛʜᴇ ᴜɴɪᴠᴇʀsᴇ ᴀɴᴅ ᴀʙᴏᴜᴛ ᴀ ϙᴜᴀʀᴛᴇʀ ᴏғ ɪᴛs ᴛᴏᴛᴀʟ ᴍᴀss–ᴇɴᴇʀɢʏ ᴅᴇɴsɪᴛʏ ᴏʀ ᴀʙᴏᴜᴛ 2.241×10−27 ᴋɢ/ᴍ3. ... ᴍᴏsᴛ ᴅᴀʀᴋ ᴍᴀᴛᴛᴇʀ ɪs ᴛʜᴏᴜɢʜᴛ ᴛᴏ ʙᴇ ɴᴏɴ-ʙᴀʀʏᴏɴɪᴄ ɪɴ ɴᴀᴛᴜʀᴇ; ɪᴛ ᴍᴀʏ ʙᴇ ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ sᴏᴍᴇ ᴀs-ʏᴇᴛ ᴜɴᴅɪsᴄᴏᴠᴇʀᴇᴅ sᴜʙᴀᴛᴏᴍɪᴄ ᴘᴀʀᴛɪᴄʟᴇs.