Sten Odenwald, Author at Astronomy.com

The Sun is the center of the solar system and provides the energy that makes life on our planet Earth possible. This image, taken by NASA’s Solar Dynamics Observatory across several wavelengths in the extreme ultraviolet part of the spectrum, shows a massive solar flare (lower right) accompanied by a large eruption of material.

Solar System, Stars

Bringing the Sun to light

Artist's depiction of the four Cluster II satellites

Robotic Spaceflight, Solar System

How the Cluster II mission studied the Sun’s effects on Earth

Solar System, Stars

Waves may be heating the solar wind — and two spacecraft caught them in action

Quantum entanglement — when the states of two particle are intertwined by the laws of quantum mechanics — has long vexed physicists. But the phenomenon may also hold the key to understanding how time emerged. Credit: J Jurik Peter/Shutterstock

Cosmology, Science

What is time? An astronomer explains the search to find its origins

Quantum entanglement — when the states of two particle are intertwined by the laws of quantum mechanics — has long vexed physicists. But the phenomenon may also hold the key to understanding how time emerged. Credit: J Jurik Peter/Shutterstock

The struggle to find the origins of time

The Planck era: Imagining our infant universe

Space Exploration

Starlink satellite streaks: How big of a problem are they?