ᴛʜᴇ ᴅᴀʀᴋ ʙɪɢ ᴘʟᴀɴᴇᴛ ᴏɴ ᴛʜᴇ ʙᴏʀᴅᴇʀ ᴏғ ᴏᴜʀ Sʏsᴛᴇᴍ Ɪs ʙᴇᴄᴏᴍɪɴɢ ᴍᴏʀᴇ ᴀɴᴅ ᴍᴏʀᴇ Ʀᴇᴀʟ. ᴡʜᴀᴛ Ɪs ᴍʏsᴛᴇʀɪᴏᴜs ᴘʟᴀɴᴇᴛ X? ɴɪʙɪʀᴜ? ᴠɪᴅᴇᴏs.
The American astronomers Mike Brown and Konstantin Batygin of the California Institute of Technology have arrived in January with the...
