The common idea presented in both ‘our solar system: In-Depth’ & ‘Our Solar System’ is our solar system in detail.
<u>Explanation
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Both of them talk about the solar system, the sun, and its planets, their constituents, sequence of the location of the planets in reference to the sun, their formation and significance.
Besides the solar system, the former also talks about the Milky Way, its formation, the explosion of two supernovas that led to the formation of solar systems, and other constituents of the Milky Way - a spiral mass and our galaxy, one among many others in the big universe.
It also gives a reason behind the location of the first four planets near the sun and the gaseous and icy masses away from the sun.
It also talks about the other masses that are there in the Milky Way like the asteroids and comets.
Formal and informal<span> language serve different purposes. The tone, the choice of words and the way the words are put together vary </span>between<span> the two styles. </span>Formal<span>language is less personal than </span>informal<span> language. It is used when writing for professional or academic purposes like university assignments.</span>
One thing my professor suggested was to make a draft of your thesis (you can always edit it later) and start on the body paragraphs. Do the conclusion and intro paragraphs afterward.