The cosmos is vast, so how do we measure it?

SEI 257514856


The NIRCam (Near-Infrared Camera) instrument on NASA?s James Webb Space Telescope?s reveals a portion of the Milky Way?s dense core in a new light. An estimated 500,000 stars shine in this image of the Sagittarius C (Sgr C) region, along with some as-yet unidentified features. A large region of ionized hydrogen, shown in cyan, contains intriguing needle-like structures that lack any uniform orientation. NASA, ESA, CSA, STScI, and S. Crowe (University of Virginia).

An estimated 500,000 stars shine in this portion of the Milky Way galaxy

NASA, ESA, CSA, STScI, and S. Crowe (University of Virginia).

One of the big challenges in communicating about space and space-time is that the universe is so large the scales are very difficult to imagine. Even just trying to get a sense of our solar system can be hard. If I were to make a scale-accurate model in which the sun is 1 centimetre across, I would have to put Pluto 42 metres away. I don’t know about your house, but mine doesn’t have a ballroom…



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