The hidden physics complicating interstellar lightsails

If we're to reach another star, chemical propulsion will not get us there in any reasonable time frame. We're going to need a ...

Lightsails have hit another speed bump on the road to interstellar travel

A new study suggests laser-driven interstellar lightsails may face a hidden efficiency problem as the very light pushing them starts behaving less helpfully.
Nasdaq

WiMi Develops A 3D Holographic LiDAR Diffuse Reflection Target Detection Chip to Fix Point Cloud Data Bias

BEIJING, May 9, 2023 /PRNewswire/ -- WiMi Hologram Cloud Inc. (NASDAQ: WIMI) ("WiMi" or the "Company"), a leading global Hologram Augmented Reality ("AR") Technology provider, today announced that it ...
BBC

Reflection of waves

This video explores the law of reflection, which states that the angle of incidence equals the angle of reflection. A specular reflection occurs when light bounces off a smooth surface, creating a ...
Scientific American

Light Can Travel Backward in Time (Sort Of)

Can we turn back time? Ask a savvy physicist, and the answer will be “it depends.” Schemes for retrograde time travel abound but usually involve irreconcilable paradoxes and rely on outlandish ...