What is the true reason for the perturbations in the orbit of Mercury?
Mercury not only orbits the Sun but the orbit itself rotates.
Could the planets of the Solar System have formed differently?
It is matter of accident that the planets exist as they do. It has been postulated that the planets could have formed in a number of ways, all resulting in stable configurations.
Do the planets also twinkle?
Mercury and Venus twinkle when observed near horizon.
Is there any planet beyond Pluto?
Astronomers suspect the existence of a planet beyond Pluto (tentatively named Persephone but as yet undetected) roughly 5 times the Earth’s size, 100 a.u distant from the Sun and orbiting the Sun once in more than 1000 years.
Among the objects of one of the voyages of the famous eighteenth century British explorer Captain Cook of the South Pacific, was an astronomical. Name it.
Observation of the transit of Venus.
Do any of the other planets, besides Saturn, have ‘rings’?
In 1977, Uranus was found to have thin rings around its equator.