Question

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?

to describe the planning steps taken in creating jwst
to highlight the major technical achievements of jwst
to show when jwst first began collecting funding
to explain how jwst was tested before its launch

Explanation:

Analyze the timeline entries

The timeline details the early stages of the James Webb Space Telescope (JWST):

• 1989: First conference to discuss the telescope.
• 1996: Committee selected to review designs.
• 1997: Funding allocated for additional studies.
• 2002: Teams selected to build components and the telescope is named.

Evaluate the options

• Option 1 ("to describe the planning steps taken in creating JWST"): This matches the progression of discussions, design reviews, studies, and team selection before actual construction or launch.
• Option 2 ("to highlight the major technical achievements of JWST"): Incorrect, as these entries focus on administrative, design, and planning phases rather than technical achievements or discoveries.
• Option 3 ("to show when JWST first began collecting funding"): Incorrect, because funding is only one of the entries (1997), not the purpose of all four entries.
• Option 4 ("to explain how JWST was tested before its launch"): Incorrect, as testing is not mentioned in these early planning steps.

Answer:

• (A) to describe the planning steps taken in creating JWST (Correct answer)
• (B) to highlight the major technical achievements of JWST
• (C) to show when JWST first began collecting funding
• (D) to explain how JWST was tested before its launch