Guest Thinkers — February 16, 2011

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Scott McLeod

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A blue planet with visible rings and several small, bright Uranus moons is set against a darkened black background.

Starts With A Bang

Hubble reveals a dark side to Uranus’s moons

Viewing Uranus’s largest moons with Hubble, astronomers hoped to find darkening on the trailing side. They found the exact opposite instead.

Image of two large elliptical galaxies surrounded by several smaller, colorful galaxies and stars against a dark background in space.

Starts With A Bang

JWST reveals that galaxies grow up quickly in our Universe

The first galaxies were irregular blobs of gas and stars. But modern features, like spiral arms and bars, appeared earlier than expected.

A split image shows a star field on the left and a COSMOS-Web survey area diagram on the right, with labeled NIRCam and MIRI footprints alongside the moon for scale, highlighting galaxies explored by JWST science.

Starts With A Bang

780,000 galaxies revealed in JWST’s largest science operation

The COSMOS-Web has just finalized their release of their full field: larger and deeper than any other JWST program. Here’s what’s inside.

Starts With A Bang

How the Milky Way-Andromeda merger became so uncertain

For decades, astronomers have claimed the Milky Way will merge with Andromeda in ~4 billion years. Here’s why, in 2025, that seems unlikely.

An artist's impression of a cluster of stars.

Starts With A Bang

JWST won’t find the very first stars, but a new telescope can

Many were hoping that JWST would find the first stars of all. Despite many hopeful claims, it hasn’t, and probably can’t. Here’s how we can.

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