资讯

(1) Different types of electromagnetic radiation such as radio waves, microwaves, visible light, and x-rays are associated with specific wavelengths. A spectrophotometer is an instrument that performs ...
The universe is a vast, mysterious place filled with wonders that often defy our understanding. Among the most fascinating ...
Now, this same black hole is once again captivating scientists with an extraordinary gamma-ray flare that’s emitted photons ...
Gamma rays are much shorter in wavelength than visible light, and carry a lot more energy—so much energy, that here on Earth we typically detect strong gamma-ray bursts only from the detonation ...
However, visible light rays are absorbed by walls, which is why windows are needed to allow the Sun’s rays into a building. Walls also absorb ultraviolet rays, which is why people don’t get ...
They're your eyes, and they receive signals that fall in the range of visible light. Light, heat, radio transmissions, and medical X-rays may not seem all that similar, yet they are all forms of ...
A faint star in a constellation visible from the Northern Hemisphere after dark may explode on Thursday in what's going to be a once in 80 years occurrence.