Hubble Space Telescope Reaches 200,000th Orbit Milestone

• The Hubble Space Telescope completed its 200,000th orbit of Earth, marking 36 years of continuous operation.
• The telescope has traveled over 8 billion km and recorded more than 1.7 million observations.
• The milestone was celebrated by targeting the galaxy cluster MACS J0417 to observe the supernova Athena.

Supernova Athena Observation

• Astronomers are aiming to re-observe the supernova Athena, originally discovered by the James Webb Space Telescope (JWST).
• The massive gravitational field of MACS J0417 acts as a gravitational lens, bending and amplifying light to make the distant supernova visible.
• Observations are expected to continue through early March 2027 to capture the supernova's reappearance.

Scientific Impact

• Measuring the timing of the supernova’s reappearance allows researchers to determine the mass distribution of the galaxy cluster.
• Data from these observations help refine the Cosmic Distance Ladder and provide more accurate constraints on the Hubble Constant, which measures the universe's expansion rate.
• Hubble’s visible and ultraviolet observation capabilities remain complementary to the infrared data provided by JWST and the upcoming Nancy Grace Roman Space Telescope.