SCIENCE

NASA's Webb spots oldest-ever galaxies

By Sanjana Shankar

1

Universe's ancient galaxies

NASA's James Webb Space Telescope has discovered four of the oldest known galaxies, formed when the universe was less than 350 million years old.

2

Unveiling cosmic history

Interestingly, the galaxies are said to belong to a period called "the epoch of reionization," when the first stars are predicted to have originated.

3

Redshift

Light from distant galaxies undergoes stretching, called redshift, due to the expansion of the universe. Webb is designed to detect this kind of infrared light.

4

Extremely early galaxies

The four galaxies had extreme redshifts and were discovered to have formed 300 to 500 million years after the Big Bang.

5

Distant galaxy

The farthest galaxy is JADES-GS-z13-0 which formed 320 million years after the Big Bang.

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