The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. The largest of such objects are the eight planets, in order from the Sun: four terrestrial planets, named Mercury, Venus, Earth and Mars; and four giant planets, including two gas giants, Jupiter and Saturn, and two ice giants, named Uranus and Neptune. The terrestrial planets have a definite surface and are mostly made of rock and metal. The gas giants are mostly made of hydrogen and helium, while the ice giants are mostly made of volatile substances such as water, ammonia, and methane. In some texts, these terrestrial and giant planets are called the inner Solar System and outer Solar System planets respectively.

Solar system

The Hyundai XCIENT Fuel Cell is the world's first mass-produced, hydrogen-powered heavy-duty truck, launched in 2020 to advance zero-tailpipe emission commercial transportation. It features a 180-kW hydrogen fuel cell system, a range of approximately 400 km, and fast refueling times (8–20 minutes). Deployed in over 10 countries, it features advanced driver assistance systems (ADAS) and a modernized 12.3-inch display-equipped cockpit. 
Key Specifications & Features
Fuel Cell System: 180 kW (dual 90 kW stacks).
Performance: 350 kW e-motor with a maximum torque of 2,237 Nm.
Range & Refueling: ~400 km range per fill (32-69 kg hydrogen capacity depending on model/region).
Infrastructure: Deployed in Switzerland, North America, Germany, and more.
Safety & Technology: Features include high-tensile steel frames, advanced collision safety systems, and ADAS.

Hyundai Xcient

The Astron h2 starfire image used in #Krea ai to generate the image then #Tripo ai to create the 3d model.

Hydrogen Engine Concept_1

Methane (US /ˈmɛθeɪn/ or UK /ˈmiːθeɪn/) is a chemical compound with the chemical formula CH4 (one atom of carbon and four atoms of hydrogen). It is a group 14 hydride and the simplest alkane, and is the main component of natural gas. The relative abundance of methane on Earth makes it an attractive fuel, though capturing and storing it poses challenges due to its gaseous state under normal conditions for temperature and pressure.

Tetrahedral structure of Methane

Structure of ice

Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.

Rock group: sedimentary

Coal

Ball and stick 3D model of the water molecule (H2O) free for download.
Molecular structure in this model is scientifically accurate (104.5 degree).

The H2O molecule is also known as the water molecule. It is composed of two hydrogen atoms and one oxygen atom. The molecular weight of this compound is 18 g/mol, and it has a molar mass of 18 g/mol. This means that 1 mol H2O contains 60218000 grams (6 × 1023) molecules.
The H2O molecule has a linear geometry and a straight line bonding between each of the atoms (on average 137 pm). The interatomic distance in hydrogen is very small (75 pm), and oxygen is relatively big (96 pm). There are two molecules in the centre of this model, and they are bound by strong interactions. Also, they can move themselves freely in all directions following their binding interactions. The most important feature of this 3D model is that it shows clearly lines of symmetry.

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