The Great Observatories: The Telescopes Changing Our View of the Universe

Environmental Science

The Great Observatories: The Telescopes Changing Our View of the Universe

Since early human civilizations, people have looked to the stars with wonder and amazement. We have always been fascinated by the universe, and our desire to explore it has led to great advancements in astronomy and the development of powerful telescopes capable of observing the cosmos in unprecedented detail.

Over the years, numerous observatories have been built around the world, each with its particular strengths and capabilities, but few can match the power and scientific potential of the Great Observatories. These four telescopes are among the most advanced and sophisticated instruments ever constructed, providing astronomers with a glimpse into the mysteries of the universe that were once thought impossible to explore.

In this article, we will explore the Great Observatories and how they are changing our view of the universe.

The Hubble Space Telescope: Unveiling Mysteries of the Cosmos

The Hubble Space Telescope, named after the astronomer Edwin Hubble, was launched into orbit in 1990 and has since revolutionized our understanding of the universe. Its primary mirror is 2.4 meters in diameter, and its instruments allow it to observe in ultraviolet, visible, and near-infrared wavelengths of light.

One of the most significant contributions of the Hubble Space Telescope is that it has allowed us to peer deeper into the universe than ever before. By taking extended exposures of the same astronomical objects, Hubble has revealed many galaxies, stars, and phenomena that would otherwise be invisible to us. It has also confirmed the existence of dark energy, a mysterious force that is accelerating the expansion of the universe.

Thanks to Hubble, astronomers have been able to capture pictures of deep space objects in exquisite detail, revealing the birth and death of stars and galaxies. Hubble's iconic images of the "Pillars of Creation" and the "Butterfly Nebula" are examples of how it has changed our view of the universe.

The Chandra X-Ray Observatory: Revealing the Invisible Universe

While visible light is the most familiar type of electromagnetic radiation, other types offer unique insights into the universe. X-rays, for example, are emitted by very hot and energetic objects, such as black holes, supernovae, and clusters of galaxies.

Launched in 1999, the Chandra X-ray Observatory is the most potent X-ray telescope ever built. It is capable of observing X-rays from sources billions of light-years away and has detected many of the universe's most energetic phenomena, including black holes and neutron stars.

Chandra has also revealed the presence of dark matter, an invisible substance believed to make up most of the matter in the universe. By observing the effects of dark matter on surrounding matter, Chandra has helped us understand better the distribution of matter in the universe.

The Spitzer Space Telescope: Peering Through the Dust

The Spitzer Space Telescope, launched in 2003, is the most significant infrared telescope ever launched into space. Infrared light is emitted by objects that are too cool to emit visible light, such as planets, brown dwarfs, and cold interstellar gas and dust.

One of Spitzer's most significant contributions has been the study of star-forming regions, where most of the universe's stars are born. Infrared radiation can penetrate dusty clouds that obscure visible light, providing a clearer view of young stars and protoplanetary disks, where planets are forming.

Spitzer has also detected the first light emitted by galaxies in the early universe, allowing astronomers to study the formation of galaxies billions of years ago.

The James Webb Space Telescope: Looking Back to the Early Universe

The James Webb Space Telescope, set to launch in 2021, is the most significant telescope ever built. With a primary mirror six times larger than Hubble's and a suite of advanced instruments, it promises to revolutionize our understanding of the universe.

One of the most significant aims of the James Webb Space Telescope is to observe the first galaxies that formed after the Big Bang, providing insights into the universe's early days. It is also expected to detect and study exoplanets around other stars, making it the most potent tool for exoplanet research to date.


The Great Observatories are impressive technological feats that continue to expand our knowledge of the universe. Each of these telescopes plays a unique role in deciphering the mysteries of the cosmos, whether it's through observing the birth and evolution of stars and galaxies or the detection of invisible phenomena like dark matter and black holes.

As technology continues to advance, we can expect even more groundbreaking discoveries from these observatories. The Great Observatories have indeed paved the way for a new era of astronomical exploration and made us understand better our place in the universe.