The universe comes with a built‑in speed cap, a hard limit that shapes everything from how stars shine to how cause and ...

The speed of light is the ultimate limit of motion, yet against the vast scale of the cosmos it becomes painfully inadequate.

My telescope, set up for astrophotography in my light-polluted San Diego backyard, was pointed at a galaxy unfathomably far from Earth. My wife, Cristina, walked up just as the first space photo ...

Imagine you’re in a car driving across the country watching the landscape. A tree in the distance gets closer to your car, passes right by you, then moves off again in the distance behind you. Of ...

We go about our busy days, occasionally glancing at our watch or the clock on the wall. But we seldom stop to think about how time really works: is it the same time here as on Mars? Is time linear and ...

I have a question regarding time dilation that I thought of last night listening to an audiobook, Project Hail Mary. I am an amateur astrophotographer, and marvel at the distance to deep-space objects ...