metallicity

This Globular Cluster is Plunging Toward the Milky Way’s Centre

Globular clusters (GCs) are spherical groups of stars held together by mutual gravity. Large ones can have millions of stars,…

2 months ago

Can Webb Find the First Stars in the Universe?

The Universe's very first stars had an important job. They formed from the primordial elements created by the Big Bang,…

2 months ago

Adolescent Galaxies are Incandescent and Contain Unexpected Elements

If the Universe has adolescent galaxies, they're the ones that formed about 2 to 3 billion years after the Big…

3 months ago

We Can't See the First Stars Yet, but We Can See Their Direct Descendants

The first stars in the Universe were enormous, made of primordial hydrogen and helium from the Big Bang. They lived…

5 months ago

A Star was Blocking a Galaxy, but Now it’s Moved Enough That Astronomers can Finally Examine What it Was Hiding

One of the biggest puzzles in astronomy, and one of the hardest ones to solve, concerns the formation and evolution…

1 year ago

Jupiter is up to 9% Rock and Metal, Which Means it Ate a lot of Planets in its Youth

Jupiter is composed almost entirely of hydrogen and helium. The amounts of each closely conform to the theoretical quantities in…

2 years ago

The Large Magellanic Cloud Stole one of its Globular Clusters

Astronomers have known for years that galaxies are cannibalistic. Massive galaxies like our own Milky Way have gained mass by…

2 years ago

Why do Planetary Nebulae Look the Way They Do?

Planetary nebulae are the most beautiful objects in the night sky. Their gossamer shells of gas are otherworldly and evocative.…

3 years ago

Some of the Milky Way’s oldest stars aren’t where they’re expected to be

Some of the oldest stars in our galaxy have orbits similar to the Sun, and we don't know why

3 years ago

The Spherical Structure at the Core of the Milky Way Formed in a Single Burst of Star Formation

Like other spiral galaxies, the Milky Way has a bulging sphere of stars in its center. It's called "The Bulge,"…

3 years ago