Question:

Recently a star, Icarus was seen by NASA’s Hubble Space Telescope. What was the approximate time taken by Icarus’ light to reach the Earth?

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Gravitational lensing is a key method for astronomers to observe extremely distant cosmic objects otherwise too faint to detect.
Updated On: Aug 14, 2025
  • Nine billion years
  • Ten million years
  • Seven trillion years
  • One hundred years
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The Correct Option is A

Solution and Explanation

Step 1: Understanding the discovery
The star Icarus (officially named MACS J1149 Lensed Star (1) was observed by NASA’s Hubble Space Telescope in 2018. It is the most distant individual star ever seen by humans.
Step 2: Time taken by light
Light from Icarus has taken approximately nine billion years to reach Earth, meaning we see the star as it was nine billion years ago.
Step 3: Why so distant?
The star was detected due to gravitational lensing — a phenomenon where massive galaxy clusters bend and magnify the light from distant objects, making them visible.
Step 4: Conclusion
The light travel time confirms the immense distance, making nine billion years the correct answer.
\[ \boxed{\text{Nine billion years}} \]
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