Hubble Space Telescope's 200,000th Orbit: Waiting for a Supernova to Reappear

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Hubble Space Telescope just completed its 200,000th orbit, and it spent the day waiting for a supernova to reappear. Here's how one explosion can show up twice.

On September 19, 2026, Hubble passed 200,000 orbits of Earth: more than 5 billion miles and more than 1.7 million observations in 36 years. That day it imaged the massive galaxy cluster MACS J0417, whose gravity bends and magnifies light from objects far behind it. In 2025 the James Webb Space Telescope spotted a supernova behind that cluster, named Athena; the blast happened when the universe was about half its current age.

KEY FACTS
• Light from Athena reaches us along several paths of different length, so the same explosion can appear again months or even years later.
• Its next appearance is predicted between now and early March 2027, and Hubble keeps coming back to look.
• The delay between appearances can map the cluster's mass and help measure how fast the universe is expanding: the Hubble constant.
• Astronomer Justin Pierel (STScI) says such an independent measurement is sorely needed.

SOURCES
NASA: https://www.nasa.gov/image-article/nasas-hubble-telescope-reaches-milestone-looks-for-elusive-supernova/
ESA/Hubble: https://esahubble.org/images/opo2623/
JWST VENUS program on SN Athena: https://jwst-venus.github.io/news/news_20260107.html
Universe Today: https://www.universetoday.com/articles/nasas-hubble-marks-its-200000th-orbit-by-watching-lensed-supernova
Images: NASA, ESA, STScI, M. Pascale (UCLA), J. DePasquale (STScI) (MACS J0417, CC BY 4.0); NASA (astronaut photos of Hubble); NASA/ESA/CSA/STScI (example clusters and a supernova in M82, not Athena).

#Hubble #Supernova #Space #Shorts #NASA #Astronomy #JamesWebb
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