Question

what is M Theory.
By Stephen Hawking​

Answer 1

• During the second string revolution, in 1995, physicists proposed that the five consistent string theories are actually only different faces of a unique theory which lives in eleven spacetime dimensions and is known as M-theory.

Answer 2

Answer:

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ᴅᴜʀɪɴɢ ᴛʜᴇ sᴇᴄᴏɴᴅ sᴛʀɪɴɢ ʀᴇᴠᴏʟᴜᴛɪᴏɴ, ɪɴ 1995, ᴘʜʏsɪᴄɪsᴛs ᴘʀᴏᴘᴏsᴇᴅ ᴛʜᴀᴛ ᴛʜᴇ ғɪᴠᴇ ᴄᴏɴsɪsᴛᴇɴᴛ sᴛʀɪɴɢ ᴛʜᴇᴏʀɪᴇs ᴀʀᴇ ᴀᴄᴛᴜᴀʟʟʏ ᴏɴʟʏ ᴅɪғғᴇʀᴇɴᴛ ғᴀᴄᴇs ᴏғ ᴀ ᴜɴɪϙᴜᴇ ᴛʜᴇᴏʀʏ ᴡʜɪᴄʜ ʟɪᴠᴇs ɪɴ ᴇʟᴇᴠᴇɴ sᴘᴀᴄᴇᴛɪᴍᴇ ᴅɪᴍᴇɴsɪᴏɴs ᴀɴᴅ ɪs ᴋɴᴏᴡɴ ᴀs ᴍ-ᴛʜᴇᴏʀʏ.