The galaxy named GLASS-z13 existed when the universe was 300 million years old. It is the oldest galaxy ever observed by the James Webb Telescope.
Previously, the oldest galaxies ever observed were GB-z11 and HD1. Scientists say that this galaxy is 400 million years old. Currently, it is known that GLASS-z13 existed 30 million years before HD1.
GLASS-z13 isn’t the only galaxy astronomers have observed. They are also studying a galaxy called GLASS-z11, which is also a candidate for one of the oldest galaxies ever observed.
Biggest or smallest?
If we look at the galaxy GLASS-z13 from far away, we are seeing something that has existed for a long time and is billions of years ahead of us. In such a situation, this galaxy is considered very old.
But we also see a time when the universe was very young, only a few hundred million years after the Big Bang. It can also be concluded that this galaxy is still young and was one of the first galaxies to be formed. Thus, we can say that the Milky Way is the oldest and youngest galaxy ever observed.