logo
The 10 most powerful telescopes on Earth and in space transforming modern astronomy

The 10 most powerful telescopes on Earth and in space transforming modern astronomy

Time of India14-07-2025
The universe holds endless mysteries, and today's most
powerful telescopes
are helping us explore them like never before. These advanced instruments drive the progress of
modern astronomy
, using radio, infrared, optical, and X-ray wavelengths to capture light from ancient galaxies, black holes, exoplanets, and other distant objects. Built in extreme environments and equipped with modern technology, they allow scientists to see far into space and look back in time. Each telescope on this list plays a vital role in uncovering how the universe began, how it changes, and what might exist beyond what we know.
Top 10 most powerful telescopes on Earth and in space
1. James Webb Space Telescope (JWST)
Launched in December 2021, the
James Webb Space Telescope
(JWST) is placed about 1.5 million kilometres away from Earth, at a special spot in space called the Sun–Earth L2 point. This location is stable and perfect for observing deep space without interruptions. JWST looks mainly in infrared light, which helps it see through thick clouds of space dust. This allows it to spot stars and galaxies that formed soon after the Big Bang. Its powerful instruments are so sensitive that they can catch the faintest light from faraway galaxies and even study the atmospheres of planets outside our solar system—possibly helping us find signs of life.
2. Five-hundred-meter Aperture Spherical Telescope (FAST)
Located in a natural depression in Guizhou, China, FAST is the world's largest and most sensitive single-dish radio telescope. With a massive 500-metre dish, FAST listens to the universe in radio frequencies—essential for detecting signals from distant pulsars, mapping interstellar hydrogen, and searching for potential extraterrestrial intelligence (SETI). Its sensitivity enables the discovery of otherwise undetectable cosmic phenomena across vast distances.
3. Extremely Large Telescope (ELT)
Under construction atop Cerro Armazones in Chile, the ELT will be the largest optical/infrared telescope ever built, with a 39-metre main mirror composed of 798 hexagonal segments. Its light-gathering power will be 250 times greater than Hubble's and will provide images 15 times sharper. Scheduled for first light around 2029, ELT is designed to investigate dark matter, black holes, early galaxies, and potentially habitable exoplanets—pushing the limits of what we know about the universe.
4. Giant Magellan Telescope (GMT)
Also rising in Chile's high desert, the GMT uses seven large mirrors to act as a single, 24.5-metre telescope. It promises image clarity up to ten times better than Hubble, enabling it to see incredibly fine details in distant objects. Scientists hope to use GMT to directly image Earth-like planets, explore galaxy formation, and deepen our understanding of the universe's accelerated expansion.
5. Thirty Meter Telescope (TMT)
Planned for construction atop Mauna Kea, Hawaii (though delayed due to site access disputes), the TMT will feature a 30-meter segmented mirror, optimised for near-infrared and optical observations. It's designed to study everything from the formation of the first galaxies to the evolution of black holes and the search for life-supporting exoplanets, offering unmatched resolution in ground-based astronomy.
6. Gran Telescopio Canarias (GTC)
Located on La Palma in Spain's Canary Islands, GTC is currently the world's largest single-aperture optical telescope with a 10.4-metre mirror. It's been instrumental in studying dark energy, stellar explosions (supernovae), and planet formation. Its location—far from city lights and high above sea level—makes it ideal for observing the universe with minimal atmospheric distortion.
7. Atacama Large Millimeter/submillimeter Array (ALMA)
Sitting high in Chile's Atacama Desert, ALMA consists of 66 movable radio antennas working together as one giant interferometer. By observing the coldest regions of space in millimetre and submillimetre wavelengths, ALMA can peer into dense gas clouds to uncover the birthplaces of stars and planets. It also studies ancient galaxies and the building blocks of life, such as organic molecules.
8. Gemini Observatory (North & South)
Gemini consists of two twin 8.1-metre telescopes—one in Hawaii (Gemini North) and the other in Chile (Gemini South). Together, they provide full-sky coverage. Equipped with adaptive optics and powerful spectrographs, Gemini can capture clear, detailed images of distant galaxies, stellar nurseries, and gamma-ray bursts. Its versatility makes it one of the most productive observatories in modern astronomy.
9. Chandra X-ray Observatory
Launched in 1999, NASA's Chandra remains one of the most important telescopes for observing the universe in X-rays, a high-energy form of light. It specialises in studying extreme environments—such as the hot gas swirling around black holes, exploding stars, and neutron stars. Chandra's precision has helped us understand the life cycles of stars and the structure of galaxy clusters.
10. Magdalena Ridge Observatory Interferometer (MROI)
Located in New Mexico, USA, the MROI uses a technique called interferometry, where light from multiple smaller telescopes is combined to simulate the resolution of a much larger one. This approach yields ultra-high-resolution images of binary star systems, stellar surfaces, and debris disks around young stars—objects typically too fine to resolve using single-mirror telescopes.
Why these telescopes are essential tools in modern astronomy
These telescopes represent the pinnacle of astronomical technology. Their large apertures allow them to gather light from the farthest corners of the universe, enabling us to look back in time. Each observatory focuses on specific wavelengths—infrared, radio, X-ray, or optical—uncovering different layers of cosmic phenomena. Technologies like adaptive optics and interferometry enhance clarity, letting scientists image distant galaxies, exoplanets, black holes, and supernovae with astonishing precision.
India's growing role in modern astronomy
Though not featured in the top‑ten global list, India contributes significantly to modern astronomy infrastructure:
Major Atmospheric Cherenkov Experiment (MACE): Operational from Hanle, Ladakh, at ~4,500 m altitude, MACE is one of the world's highest gamma-ray telescopes. Commissioned in 2021 and inaugurated in
2024
, it advances research in cosmic rays and fundamental physics.
Devasthal Optical Telescope (DOT): Located at ARIES in Uttarakhand, the 3.6-metre DOT is Asia's largest optical telescope. Commissioned in
2016
, it supports advanced imaging and spectroscopy and plays a critical role in regional space research.
These ten telescopes are among the most advanced tools ever built for exploring space. From JWST's deep cosmic gaze to ALMA's insight into galactic birthplaces, they're transforming our understanding of the universe. As more such observatories become operational—and with countries like India boosting their astronomical capabilities—the future of space exploration looks brighter than ever.
Orange background

Try Our AI Features

Explore what Daily8 AI can do for you:

Comments

No comments yet...

Related Articles

Asteroid 2024 YR4 will miss Earth but might strike the moon – what happens if it does?
Asteroid 2024 YR4 will miss Earth but might strike the moon – what happens if it does?

Time of India

timea day ago

  • Time of India

Asteroid 2024 YR4 will miss Earth but might strike the moon – what happens if it does?

An asteroid once thought to be heading for Earth is now out of sight, but not out of mind. Named 2024 YR4, this 200-foot-wide space rock could strike the moon in late 2032. And scientists are paying close attention to what that could mean for both space missions and life on Earth. From 'City Killer' to lunar threat Discovered in late 2024 by the ATLAS telescope in Chile, asteroid 2024 YR4 raised alarms. At one point, it had a 3.1% chance of hitting Earth by December 22, 2032—the highest risk ever recorded for an asteroid, according to NASA . That changed after new measurements were taken using ground-based telescopes and the James Webb Space Telescope (JWST). These helped track the asteroid more precisely, improving its predicted orbit by 20%. The good news: Earth is now safe. But the not-so-good news? The moon might not be. What happens if it hits? A moon impact would not threaten life on Earth directly. But the consequences could still be significant. Scientists say the strike could form a 1-kilometer-wide crater on the moon and send up to 100 million kilograms of dust and rock into space. The size of such rocks is not an issue, as the atmosphere will protect Earth from that. However, the debris could harm satellites or even astronauts on the moon. Fine lunar dust, traveling faster than a bullet, might reach Earth within days or months and trigger a bright meteor shower . Tracking, planning, and what comes next Scientists are already preparing to observe YR4 again when it comes back into view around 2028. A proposal by MIT's Julien de Wit and Johns Hopkins' Andy Rivkin to use Webb for an early look in 2026 was recently approved. 'This newly approved program will buy decision makers two extra years to prepare, though most likely to relax, as there is an 80% chance of ruling out impact,' said de Wit. Rivkin, who led the DART mission that successfully deflected a different asteroid in 2022, says YR4 presents a different kind of question. Would we ever try to deflect something headed for the moon? 'We realize that an impact to the moon could be consequential, so what would we do?' said de Wit. As more infrastructure, missions, and astronauts are expected on the moon in the coming decades, astronomers believe events like YR4 must be taken seriously. 'If this really is a thing that we only have to worry about every 5,000 years or something, then maybe that's less pressing,' Rivkin said. 'But even just asking what would we do if we did see something that was going to hit the moon is at least something that we can now start thinking about.'

Harvard Scientist Claims Rare Interstellar Object Might Be "Alien Technology"
Harvard Scientist Claims Rare Interstellar Object Might Be "Alien Technology"

NDTV

time3 days ago

  • NDTV

Harvard Scientist Claims Rare Interstellar Object Might Be "Alien Technology"

A Harvard Scientist claimed that 3I/ATLAS, a rare and mysterious visitor of our solar system, might be a piece of "alien technology". The comet is the third known object ever discovered coming from outside our solar system. Theoretical physicist Professor Avi Loeb told Newsweek that an alien civilisation could have sent the object. The object has been categorised as interstellar because of the hyperbolic shape of its orbital path. It does not follow a closed orbital path about the Sun, NASA explained. The space agency mentioned that the comet is simply passing through our solar system and will continue its journey into interstellar space. "The retrograde orbital plane of 3I/ATLAS around the Sun lies within 5 degrees of that of Earth... The likelihood of that coincidence out of all random orientations is 0.2 per cent," Loeb told the news outlet. 3I/ATLAS was discovered on July 1, 2025, by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey telescope in Chile. Scientists have estimated that 3I/ATLAS is approximately 10-20 kilometres in diameter, making it the largest interstellar object detected so far. According to Loeb, the brightness of 3I/ATLAS suggests that the object is around 20 kilometres in diameter. He explained that it is "too large for an interstellar asteroid" and "might have targeted the inner Solar System as expected from alien technology". Loeb said that the object lacks features of the comets. "No spectral features of cometary gas are found in spectroscopic observations of 3I/ATLAS," he said. Meanwhile, other scientists are wary of Loeb's claims. Richard Moissl, Head of Planetary Defence at the European Space Agency, told Newsweek: "There have been no signs pointing to non-natural origins of 3I/ATLAS in the available observations." The comet will reach its closest point to the Sun (perihelion) on October 29, 2025, passing just inside Mars' orbit. The astronomers are studying 3I/ATLAS using ground- and space-based telescopes, including the Hubble Space Telescope and the James Webb Space Telescope (JWST), to learn more about its composition, structure, and origin.

DOWNLOAD THE APP

Get Started Now: Download the App

Ready to dive into a world of global content with local flavor? Download Daily8 app today from your preferred app store and start exploring.
app-storeplay-store