Far future

The Far future, is defined in the calendar of Earth as being from the 28th century until the end of time.
 * The notation BCE ("Before Common Era") and CE ("Common Era") are alternative neutral notations for BC ("Before Christ") and AD ("anno Domini"), respectively.

123rd Century

 * Radiation levels in the Andromeda Galaxy are expected to reach intolerably high levels within the next ten millennia, according to scientists of the Kelvan Empire. Agents of the Kelvan Empire were dispatched aboard a multigenerational spacecraft to explore the Milky Way Galaxy for possible colonization. (TOS: "By Any Other Name")

c. 500 000 Years from Now

 * The androids of planet Mudd cease to function. (TOS: "I, Mudd")

2 Million Years from Now

 * Nella Daren's projected star model is either proven or disproven. (TNG: "Lessons")

5 Billion Years from Now

 * Sol, the central star of the Sol system, eventually dies and fades to darkness.

60-70 Trillion Years from Now

 * If Jack, a genetically-engineered human, was correct, his predicted collapse of the universe will occur. (DS9: "Chrysalis")
 * The fight between Lazarus and his counterpart from the anti-matter universe ends with the destruction of the universe. (TOS: "The Alternative Factor")