• 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