Goddard Precision — 2 museum-grade prints that set the mood. RXTE transformed X-ray astronomy from snapshot imaging to high-speed timing — revealing quasi-periodic oscillations from matter spiraling near black holes and neutron stars. Its All-Sky Monitor provided early alerts that other observatories, including Chandra and XMM-Newton, followed up with pointed observations. COBE ended decades of debate about whether the cosmic microwave background was truly uniform, revealing the tiny fluctuations that seeded galaxies and clusters. Its results underpinned inflationary cosmology models and set the precision bar WMAP (2001) and Planck later surpassed.