Send the following on WhatsApp
Continue to ChatHow to study gravitational lenses with X-rays https://www.urban-astronomer.com/news-and-updates/how-to-study-gravitational-lenses-with-x-rays/
How to study gravitational lenses with X-rays https://www.urban-astronomer.com/news-and-updates/how-to-study-gravitational-lenses-with-x-rays/