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The far side of the moon is not visible from Earth due to a phenomenon called tidal locking, where the moon’s rotation is synchronized with its orbit around Earth. This means that the same side of the moon always faces Earth, leaving the far side permanently hidden from view. However, spacecraft and satellites have been able to capture images of the far side, providing valuable insights into the moon’s geology and history.

Source: https://www.livescience.com/space/astronomy/why-cant-we-see-the-far-side-of-the-moon

NASA’s X-ray satellite, XMM-Newton, has captured stunning images of a cosmic phenomenon known as the “Cloverleaf.” This four-leaf clover-shaped structure is created by the gravitational lensing effect of a distant galaxy, allowing scientists to study the properties of dark matter and the evolution of galaxies. The images provide new insights into the structure and dynamics of the Cloverleaf and its surrounding environment.

Source: https://www.nasa.gov/missions/xmm-newton/x-ray-satellite-xmm-newton-sees-space-clover-in-a-new-light/