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American Focus > Blog > Tech and Science > Why Can’t the Hubble Space Telescope See Astronauts on the Moon?
Tech and Science

Why Can’t the Hubble Space Telescope See Astronauts on the Moon?

Last updated: August 31, 2024 4:15 pm
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Why Can’t the Hubble Space Telescope See Astronauts on the Moon?
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Back in the early 2000s, there was a prevalent conspiracy theory that the Apollo moon landings were faked. One common argument used by these conspiracy theorists was based on the capabilities of NASA’s Hubble Space Telescope. They questioned why the telescope, known for capturing intricate details of distant galaxies, couldn’t see the Apollo astronaut boot prints on the moon.

This argument, although seemingly persuasive at first glance, crumbles under scrutiny due to a misunderstanding of how telescopes function and the vastness of space. While many believe that the primary function of a telescope is to magnify images, the real strength lies in its resolution rather than magnification. Resolution refers to the ability to distinguish two closely spaced objects, while magnification simply enlarges images.

Telescopes have inherent limitations when it comes to resolution, which is determined by the size of their mirrors or lenses. The larger the optics, the better the resolution, with shorter wavelengths yielding higher resolution. However, even with advancements in telescope technology, there is a fundamental property of light called diffraction that cannot be overcome. This diffraction limits the resolution of telescopes regardless of their size.

The Hubble Space Telescope, with its 2.4-meter-wide mirror, has impressive resolution capabilities. However, the resolution is limited by the wavelength of light it observes. NASA’s James Webb Space Telescope (JWST), with a larger 6.5-meter mirror, surpasses Hubble in resolution at certain wavelengths. But at longer infrared wavelengths, JWST’s resolution is comparable to Hubble’s at visible light wavelengths.

When it comes to observing objects in space, astronomers measure resolution as an angle on the sky. Hubble’s resolution of about 0.05 arcsecond is incredibly small, but the level of detail it can capture depends on the distance and size of the object. For instance, at its best resolution, Hubble could potentially discern the size of a dime from a distance of 140 kilometers.

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The conspiracy theorists’ argument about spotting boot prints on the moon using the Hubble Space Telescope is debunked by the telescope’s limitations. While Hubble can capture detailed images of galaxies millions of light-years away, its resolution restricts it from seeing objects smaller than 90 meters at the distance of the moon. Even the Apollo lunar landers, which were only about four meters across, are beyond the resolution capabilities of the Hubble Telescope.

On the contrary, NASA’s Lunar Reconnaissance Orbiter (LRO) has provided detailed images of the Apollo landing sites, showcasing the landers and trails of boot prints left by the astronauts. The LRO’s closer proximity to the lunar surface allows it to capture finer details that are inaccessible to the Hubble Telescope.

In conclusion, understanding the intricacies of telescope resolution and the limitations imposed by diffraction helps to debunk misconceptions and conspiracy theories. While telescopes like the Hubble Space Telescope offer incredible insights into the universe, they have inherent limitations that prevent them from seeing minute details on celestial bodies like the moon. For capturing finer details, missions like the LRO play a crucial role in providing a more comprehensive view of space exploration.

TAGGED:AstronautsHubbleMoonSpaceTelescope
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