Explain new developments related to the solar system
A. New Developments in the Solar System:
- Change in Number of Planets
- Before: 9 planets
- Now: 8 planets (Pluto is now called a dwarf planet)
- The 8 planets:
- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- Discovery of Dwarf Planets
- These are small planet-like objects.
- Examples: Pluto, Eris, Ceres
- Inclination and Tilt of Planets
- Planets are not straight; they tilt on their axes.
- Earth’s tilt is about 23.5°, which causes seasons.
- Pole Shifts
- Scientists have observed slight movements of Earth’s magnetic poles.
- These shifts may affect climate and compass directions in the long term.
- New Moons and Planets
- More moons and small planets have been discovered using powerful telescopes.
- Space Missions
- Rovers and satellites sent to Mars, Moon, and other planets to explore.
- Examples: NASA’s Perseverance rover on Mars.
- Study of Exoplanets
- Exoplanets are planets outside our solar system.
Scientists are now discovering hundreds of exoplanets.