▁ent ice ▁future ▁humans , ▁who ▁might ▁invent ▁time ▁travel ▁technology , ▁to ▁come ▁back ▁and ▁demonstrate ▁it ▁to ▁people ▁of ▁the ▁present ▁time . ▁Events ▁such ▁as ▁Per th ' s ▁Dest ination ▁Day ▁or ▁M IT ' s ▁Time ▁Tra vel er ▁Convention ▁heavily ▁public ized ▁permanent ▁" ad vert is ements " ▁of ▁a ▁meeting ▁time ▁and ▁place ▁for ▁future ▁time ▁travel ers ▁to ▁meet . ▁In ▁ 1 9 8 2 , ▁a ▁group ▁in ▁Baltimore , ▁Maryland , ▁ident ifying ▁itself ▁as ▁the ▁K ron onaut s , ▁hosted ▁an ▁event ▁of ▁this ▁type ▁wel coming ▁visitors ▁from ▁the ▁future . ▁These ▁experiments ▁only ▁stood ▁the ▁possibility ▁of ▁generating ▁a ▁positive ▁result ▁demonstr ating ▁the ▁existence ▁of ▁time ▁travel , ▁but ▁have ▁failed ▁so ▁far — no ▁time ▁travel ers ▁are ▁known ▁to ▁have ▁attended ▁either ▁event . ▁Some ▁versions ▁of ▁the ▁many - world s ▁interpretation ▁can ▁be ▁used ▁to ▁suggest ▁that ▁future ▁humans ▁have ▁tra ve led ▁back ▁in ▁time , ▁but ▁have ▁tra ve led ▁back ▁to ▁the ▁meeting ▁time ▁and ▁place ▁in ▁a ▁parallel ▁universe . ▁ ▁For ward ▁time ▁travel ▁in ▁physics ▁ ▁Time ▁d ilation ▁▁ ▁There ▁is ▁a ▁great ▁deal ▁of ▁observable ▁evidence ▁for ▁time ▁d ilation ▁in ▁special ▁relativ ity ▁and ▁gravit ational ▁time ▁d ilation ▁in ▁general ▁relativ ity , ▁for ▁example ▁in ▁the ▁famous ▁and ▁easy - to - rep licate ▁observation ▁of ▁atmos pher ic ▁mu on ▁decay . ▁The ▁theory ▁of ▁relativ ity ▁states ▁that ▁the