Rossi X-ray Timing Explorer

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What Wikipedia says

The Rossi X-ray Timing Explorer (RXTE) was a NASA satellite that observed the time variation of astronomical X-ray sources, named after physicist Bruno Rossi. The RXTE had three instruments — an All-Sky Monitor, the High-Energy X-ray Timing Experiment (HEXTE) and the Proportional Counter Array.

Excerpt from the Wikipedia article “Rossi X-ray Timing Explorer”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: user:GDK, Public domain, via Wikimedia Commons.