💁♂️: Currency can be pegged to another by enforcing a fixed exchange rate - which stabilizes the currency and gives confidence for long-term predictability. Stable-coins are often pegged to the US dollar.
🤔: Luna crash in May 2022 caused several other networks to also crash which caused Tether (A stable-coin) to be depegged from the US dollar.
🤔: Time dilation can be caused by a difference in the relative velocity between them (special relativistic "kinetic" time dilation) or to a difference in gravitational potential between their locations (general relativistic gravitational time dilation).