NASAのインスタグラム(nasagoddard) - 12月5日 04時46分

These three images are of the central region of the magnificent spiral galaxy M100, taken with three generations of @NASAHubble cameras that were sequentially swapped out aboard the telescope. They document the consistently improving capability of the observatory.

The first image was taken with the Wide Field and Planetary Camera 1 in 1993. The photo is blurry due to a manufacturing flaw (called spherical aberration) in Hubble's primary mirror. Celestial images could not be brought into a single focus. [Credit: NASA, ESA, and Judy Schmidt]

The middle image was taken in late 1993 with Wide Field and Planetary Camera 2 that was installed during the December 2 – 13 space shuttle servicing mission (SM1, STS-61). The camera contained corrective optics to compensate for the mirror flaw, and so the galaxy snapped into sharp focus when photographed. [Credit: NASA, ESA, and J. DePasquale (STScI)] The final image was taken with a newer instrument, Wide Field Camera 3, that was installed on Hubble during the space shuttle servicing mission 4 in May 2009. [Credit: NASA, ESA, and Judy Schmidt]

In celebration of the 25th anniversary of NASA's first space servicing mission to Hubble, these comparison photos of one of the telescope's first targets are being released today.

#space #Galaxies #Hubble #Telescope #astronomy

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