A sunspot with centre twice the size of Earth

  • A contorted centre of a sunspot that is nearly twice the diameter of the Earth, along with other invisible details of our Sun, has been unveiled by scientists.
  • The results are an important expansion of the range of observations that can be used to probe the physics of our nearest star.

About ALMA:

  • The Atacama Large Millimetre/submillimetre Array (ALMA) antennas designed so that they could image the Sun in exquisite detail using the technique of radio inter-ferometry.
  • It is used to image the millimetre-wavelength light emitted by the Sun’s chromosphere.
  • The images demonstrate ALMA’s ability to study solar activity at longer wavelengths of light than are typically available to solar observatories.

Source: The Hindu

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