While the Hubble Space Telescope is incredibly famous and iconic, it's not necessarily NASA's *most* famous telescope. It really depends on what you consider "fame" to mean.

Here's why:

* Public Recognition: Hubble is undoubtedly the most recognizable telescope due to its stunning images and constant presence in popular media.

* Scientific Impact: Hubble has revolutionized astronomy, making groundbreaking discoveries about the age and expansion of the universe. But other telescopes like the Chandra X-ray Observatory have been instrumental in understanding the universe's hot and energetic phenomena.

* Historical Significance: The James Webb Space Telescope, launched in 2021, is considered the successor to Hubble and is already making major contributions to astronomy. It's rapidly gaining fame and may eventually surpass Hubble in public recognition.

Ultimately, Hubble is arguably the most famous telescope due to its captivating imagery and its role in public outreach. However, other NASA telescopes are equally important for their scientific contributions and historical impact.