Look at the timeline excerpt from Chapter Four of Windows to the Universe: Revolutions in Astronomy.1989: The first conference to discuss a space-based infrared telescope is held.1996: A committee of 18 members is selected to review designs.1997: Funding is allocated for additional studies.2002: Teams are selected to build components, and the telescope is named after former NASA administrator James Webb.What is the purpose of the first four entries of the timeline?