Course Content
Geography Form 1

Explain new developments related to the solar system

A. New Developments in the Solar System:

  1. 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

  2. Discovery of Dwarf Planets

    • These are small planet-like objects.

    • Examples: Pluto, Eris, Ceres

  3. Inclination and Tilt of Planets

    • Planets are not straight; they tilt on their axes.

    • Earth’s tilt is about 23.5°, which causes seasons.

  4. Pole Shifts

    • Scientists have observed slight movements of Earth’s magnetic poles.

    • These shifts may affect climate and compass directions in the long term.

  5. New Moons and Planets

    • More moons and small planets have been discovered using powerful telescopes.

  6. Space Missions

    • Rovers and satellites sent to Mars, Moon, and other planets to explore.

    • Examples: NASA’s Perseverance rover on Mars.

  7. Study of Exoplanets

    • Exoplanets are planets outside our solar system.

Scientists are now discovering hundreds of exoplanets.

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