Are scientists currently building an infrared telescope designed to observe fusion reactions in the Sun’s core?

Answer 1

It is not possible to make a conventional telescope to see the inside core of Sun. The Gama rays produced at center takes thousand so years to reach the surface. On the way they change into infrared, visible light and UV rays.

Only neutrinos travel at speed of light to out side form Suns core..
So only neutrino telescope can tell what is happening at the core.

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Answer 2

Everett Abrams

Indeed, the Daniel K. Inouye Solar Telescope (DKIST) is being built to observe the Sun infrared light, including its core. But its main goal is to investigate the Sun's magnetic fields and how they affect solar activity.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.