What is dark matter?
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ᴅᴀʀᴋ ᴍᴀᴛᴛᴇʀ ᴄᴀɴ ʀᴇғᴇʀ ᴛᴏ ᴀɴʏ sᴜʙsᴛᴀɴᴄᴇ ᴡʜɪᴄʜ ɪɴᴛᴇʀᴀᴄᴛs ᴘʀᴇᴅᴏᴍɪɴᴀɴᴛʟʏ ᴠɪᴀ ɢʀᴀᴠɪᴛʏ ᴡɪᴛʜ ᴠɪsɪʙʟᴇ ᴍᴀᴛᴛᴇʀ (ᴇ.ɢ., sᴛᴀʀs ᴀɴᴅ ᴘʟᴀɴᴇᴛs). ʜᴇɴᴄᴇ ɪɴ ᴘʀɪɴᴄɪᴘʟᴇ ɪᴛ ɴᴇᴇᴅ ɴᴏᴛ ʙᴇ ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴀ ɴᴇᴡ ᴛʏᴘᴇ ᴏғ ғᴜɴᴅᴀᴍᴇɴᴛᴀʟ ᴘᴀʀᴛɪᴄʟᴇ ʙᴜᴛ ᴄᴏᴜʟᴅ, ᴀᴛ ʟᴇᴀsᴛ ɪɴ ᴘᴀʀᴛ, ʙᴇ ᴍᴀᴅᴇ ᴜᴘ ᴏғ sᴛᴀɴᴅᴀʀᴅ ʙᴀʀʏᴏɴɪᴄ ᴍᴀᴛᴛᴇʀ, sᴜᴄʜ ᴀs ᴘʀᴏᴛᴏɴs ᴏʀ ɴᴇᴜᴛʀᴏɴs.
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(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 ).
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