The outline of the astronomical universe

Planet; ; star

Galaxy solar system

Galaxy: The Milky Way.

Cluster: local group

For example, we observed that M 15 M 16 are all like this. Looks familiar. Isn't Altman from the M 18 nebula?

The higher structure has not been observed, but people are YY people.

There are some stars and some galaxies in the telescope photos. The difference is whether there is a cross, which is the diffraction cross. If it is round or oval, it is a galaxy. If it is a light spot, the obvious cross halo can be seen around the light spot, then it is a star (because the homologous light emitted by the point light source is diffracted when passing through the lens), and the planet is invisible.

There are many mistakes in this, but I hope it will help you. Astronomy itself is not something that can be finalized.

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