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How many undiscovered planets might be in our solar system?

Let's take a look at the 2006 IAU planet definition A celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes ...

In which Indian Institutions can I find Planetary Scientists or Planetary Geologists?

There are probably many, but I'll highlight one. The Physical Research Laboratory has a Planetary Research Division. We study solar system objects, their atmospheres, surfaces and interiors, and ...
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How many undiscovered planets might be in our solar system?

Our current understanding of planetary formation is that planets form from a protoplanetary disk that thins out the further we move away from the Sun. We can see this by observing that Neptune and ...
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Could a planet have a massive crater without collapsing due to gravity / other factors?

The short answer is no! But the process would take time. If we imagine that some impact causes the crater at some $t_0$ in the past, then the exact time frame on which the planet would begin to warp ...

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