there are three topics. In fact, I don't think it's difficult to see which side is a microphotograph, but it's more difficult to see exactly what it is.

Let's guess, on the left and right, which side is from space and which side is physiology?

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publish the answer below:

1. On the left is physiology, showing bovine aortic endothelial cells. On the right is space, the surface structure of Pluto captured by NASA New Horizon.

2. On the left is the physiology, immunofluorescence image of mouse cardiac progenitor cells. On the right is space, which is exactly what the Maldives looks like from space.

3. On the left is space, a gully on the surface of Enceladus captured by Cassini. On the right is physiology, showing a transmission electron microscope image of the rough endoplasmic reticulum.

Source: https://twitter.com/ThePhySoc