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A new interpretation is needed for the Bullet Cluster.

It will show the unnecessity of Dark Matter.

These two galaxy clusters A & B collided recently (150 million years ago). B is the Bullet Cluster. It is said that this Bullet Cluster provides the best current evidence for the nature of dark matter.

One important fact is that almost all galaxies and stars keep staying inside of their own original galaxy-clusters. Only their gas lumps collided and heated up, and were emitting X-ray, but were stripped off between two galaxies.
Then, some questions arise.
Q1: Time has already passed 150 million years. How these two gas lumps can keep their shapes without the gravity of their original galaxy clusters?
Q2: Why didn't these two gas spread away because of their heated-up high pressure? Of course, these two gas lumps have their own masses. But they are not enough to keep them stay as they were.
Q3: The mass of gas is about one-sixth of its whole galaxy mass. One-sixth is still big. Even though, why are there no indications of masses of the gas through the investigation of the gravitational lensing?
Q4: Why is not the loss or gain kinetic energy or momentum of each gas lump equivalent? MBgas and 'db' are smaller than MAgas and 'da'. 'da' must be much smaller, or 'db' should be bigger.