#space!

Also this video out of context made me giggle. The excited ‘hey!!’ And its just a photo of some grainy greyscale streaks lmaoo.

It was a small part of the veil nebula, which was too big to capture in one shot in enough detail. This was what it looked like once we’d processed it!!!

ok and the atomic structure of elements is different for each element right. so the light electrons give off/absorb will be unique to each element. so elements each have a unique light signature called emission or absorption spectrum. so you can find out what something is made of based purely on the kind of light it produces.

but remember! light (energy) (em radiation) is waves. if it was one stationary object sending light to another stationary object then the wavelength wouldn't change. but. everything in space is moving. and space itself is expanding. which means the wavelengths get longer when traveling to us (usually) because its moving away. so everythings shifted to the red. why red? red has longer wavelengths. why? because we gave a name to the lower frequency wavelengths we can perceive and we called it red. theres no actual way of proving that we perceive these wavelengths the same, just that we called them the same. dont worry about it. we also CANT perceive the "reddest" wavelengths so they aren't really true red in the way visible red is, but we call it red

anyway because of the expansion of space and the physics of how light travels, as the universe itself gets bigger, the observable universe gets smaller.