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Why Do We Need a Space Telescope with a View 100 Times Wider Than Hubble?
Space ScienceStandardAbout 4 min
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When you look up at the night sky, you can see only a few thousand stars with your naked eye. Scientists want to understand the overall structure of the universe, but existing telescopes are like looking through a straw—they can only see a tiny patch of sky at a time. To explore the universe more comprehensively, NASA plans to launch a new space telescope on August 30, 2026—the Nancy Grace Roman Space Telescope. What makes it special? Why do scientists need it?
The Roman telescope is designed to "see wide." It is equipped with a 300-megapixel infrared camera with a field of view at least 100 times larger than that of the Hubble Space Telescope. This means it can capture a patch of sky 100 times larger than Hubble in a single shot. It also has a special instrument—a coronagraph—that can block out starlight to directly image exoplanets orbiting their stars. The telescope will be placed at the second Lagrange point (L2), about 1 million miles from Earth, where gravitational balance allows stable observation.
Imagine you want to find out how many types of trees are in a forest. If you stand in one spot, you can only see a few trees in front of you; but if you fly high above, you can see the entire forest distribution. The Roman telescope's wide field of view allows scientists to observe large areas of the sky at once, quickly mapping the universe. This is especially important for studying dark energy and dark matter, because these mysterious substances affect the expansion and structure of the universe, but they do not emit light. Scientists can only infer their presence by observing the distribution of many galaxies.
The Roman telescope's primary mission is to study dark energy, dark matter, and exoplanets. Scientists estimate it will discover thousands of new exoplanets and help us understand the history and future of the universe. The mission's design lifetime is five years, but scientists hope it can be extended to ten years or more, like Hubble. This will lay the foundation for future astronomical observations and open a new era of space exploration.
The Roman telescope has not yet been launched, so what it will actually observe remains unknown. Scientists are excited about its capabilities, but real discoveries will only be revealed after it begins working. Additionally, although its field of view is 100 times larger than Hubble's, its resolution (the ability to see fine details) is the same as Hubble's, so it will not replace Hubble but complement it.
To understand this article, you need to know two concepts: Field of View: The area of the sky a telescope can see at once. Like using a camera, a wide-angle lens captures more scenery; the larger the field of view, the larger the area of the sky observed. The Roman telescope's field of view is 100 times larger than Hubble's, meaning it can capture an area 100 times larger in a single shot, but it does not mean it sees more clearly. Resolution: The ability to distinguish two close objects. Higher resolution means clearer details. The Roman telescope has the same resolution as Hubble, so it will not take sharper images, but it can capture a much larger area.
Note: A field of view 100 times larger does not mean 100 times higher resolution. The Roman telescope has the same resolution as Hubble, just a wider view.
The Roman telescope is named after Nancy Grace Roman, NASA's first female astronomer, known as the 'Mother of Hubble'.
This article was researched and written from the following materials:
Primary research: NASAOpen link
News report: NASA28 August 2026Read the original
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