The prompt asks for a summary of key discoveries made by a specific scientific instrument (the Hubble Space Telescope) and requests citations from reliable sources. This approach helps to determine the source of the information provided and allows users to check for accuracy.

Prompt

User: "What are the top 3 most important discoveries that the Hubble Space Telescope has enabled?
Answer only using reliable sources and cite those sources."

Response

The Hubble Space Telescope has been instrumental in numerous groundbreaking discoveries. Here are three of the most important:

1. Expansion of the Universe and Dark Energy: Hubble played a crucial role in determining that the universe's expansion is accelerating, leading to the discovery of dark energy. This mysterious force, making up about 74% of the universe's mass-energy content, remains one of the biggest enigmas in physics. Understanding dark energy is pivotal for grasping the future of the universe and has fundamentally altered our comprehension of cosmology​.
2. Age and Evolution of the Universe: By observing distant galaxies and refining the Hubble Constant, the telescope helped pinpoint the age of the universe at approximately 13.7 billion years. Hubble's ability to look deep into space, and thus back in time, has allowed astronomers to study the formation and evolution of galaxies and star systems, providing insights into the universe's history and development​.
3. Black Holes in Galaxies: Hubble's observations have revealed that supermassive black holes reside at the centers of most galaxies. The tight correlation between the mass of these black holes and the properties of their host galaxies has shed light on the co-evolution of galaxies and black holes, revolutionizing our understanding of galaxy formation and dynamics​.

These discoveries are just a few examples of how Hubble has transformed our knowledge of the cosmos, continuing to influence astronomical research and our understanding of the universe's fundamental properties.

Sources: 17 Amazing Hubble Discoveries; Hubble's 10 Most Significant Discoveries; Britannica Hubble Space Telescope