The names you mentioned—SIRTF, SIM, NGST, and TPF—formed the original core roadmap for NASA's Origins Program. Formulated in the mid-to-late 1990s, this ambitious suite of four space telescopes was designed to trace the history of the universe, understand how stars and galaxies formed, and search for habitable Earth-like exoplanets.

The names you mentioned—SIRTF, SIM, NGST, and TPF—formed the original core roadmap for NASA's Origins Program. Formulated in the mid-to-late 1990s, this ambitious suite of four space telescopes was designed to trace the history of the universe, understand how stars and galaxies formed, and search for habitable Earth-like exoplanets.