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  2. Cosmic ray astronomy - Wikipedia

    en.wikipedia.org/wiki/Cosmic_ray_astronomy

    Cosmic ray astronomy faces difficulty in identifying the exact sources of cosmic rays because charged particles are deflected by magnetic fields in space, and as a result tracing the paths of cosmic rays back to their origins require sophisticated modeling techniques and multi-messenger observations to infer their source locations.

  3. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Why is the magnetic reconnection effect many orders of magnitude faster than predicted by standard models? Space weather prediction: How does the Sun produce strong southward-pointing magnetic fields in solar coronal mass ejections that lead to geomagnetic storms? How can we predict solar and geomagnetic super-storms? [8]

  4. Nonmagmatic meteorite - Wikipedia

    en.wikipedia.org/wiki/Nonmagmatic_meteorite

    Nonmagmatic meteorite (also nonmagmatic iron meteorite) is a deprecated term formerly used in meteoritics to describe iron meteorites that were originally thought to have not formed by igneous processes, to differentiate them from the magmatic meteorites, produced by the crystallization of a metal melt. [1]

  5. Reticulum - Wikipedia

    en.wikipedia.org/wiki/Reticulum

    Reticulum is a small, faint constellation in the southern sky.Its name is Latin for a small net, or reticle—a net of crosshairs at the focus of a telescope eyepiece that is used to measure star positions. [2]

  6. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    Astronomy is a natural ... Only 10% of gamma-ray sources are non-transient sources. ... The aurora are created when solar wind particles are guided by the magnetic ...

  7. Polar alignment - Wikipedia

    en.wikipedia.org/wiki/Polar_alignment

    A special reticle is used to align the mount with Polaris (or a group of stars near the polar region) in the Southern Hemisphere. While primitive polariscopes originally needed the careful adjustment of the mount to match the time of year and day, this process can be simplified using computer apps that calculate the correct position of the reticle.

  8. Zeta Reticuli - Wikipedia

    en.wikipedia.org/wiki/Zeta_Reticuli

    Zeta Reticuli, Latinized from ζ Reticuli, is a wide binary star system in the southern constellation of Reticulum.From the southern hemisphere the pair can be seen with the naked eye as a double star in very dark skies.

  9. Cosmic ray - Wikipedia

    en.wikipedia.org/wiki/Cosmic_ray

    Cosmic rays attract great interest practically, due to the damage they inflict on microelectronics and life outside the protection of an atmosphere and magnetic field, and scientifically, because the energies of the most energetic ultra-high-energy cosmic rays have been observed to approach 3 × 10 20 eV [16] (This is slightly greater than 21 ...

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