Light gathered by ground based telescopes suffers from interference due to terrestrial sources termed as light noise. The Earth's atmosphere has a radio and an optical window, while it absorbs radiation of most other wavelengths. The Hubble Space Telescope does not have both of the above problems. Therefore, it has a better sensitivity and resolution than most ground based telescopes. A major disadvantage is that if something goes wrong, it is extremely difficult to repair.
Radio waves have large wavelengths from a centimetre to tens of thousands of metres.
This makes it necessary to build larger telescopes. Also, the amount of energy received on Earth from radio radiation is extremely small, making it essential to build huge telescopes, to have a better sensitivity. The first four planets, Mercury, Venus, Earth and Mars, which are closer to the Sun are collectively called as the terrestrial or the inner planets. While, planets like Jupiter, Saturn, Uranus, Neptune and Pluto are known as the jovian or the outer planets. The inner planets have dense rocky cores, are smaller in size and have less mass.