Does dark matter actually exist?

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It has never been directed detected, and some say that it might not actually exist. Some say that concept will be done away with in the future much like aether which was once thought to exist in space turned out not to actually exist.

Until it can be directly observed or measured with instruments, nobody will know for certain.

It's the fruit cakes.

All of those fruit cakes folks give each other a Xmas time that no one ever eats. They now add up to ...80 percent of the mass of the Universe!