Venus - Venus is the second planet in the solar system and our closest celestial neighbor. This led it to be named after the Roman goddess of love and beauty, Venus.
Pluto: Although not technically a planet, Pluto has a fascinating weather system that includes a thin atmosphere of nitrogen, methane, and carbon monoxide. Due to its distance from the sun, Pluto experiences extreme temperature variations that can cause its atmosphere to freeze and collapse.
Mars -The origin of water on Mars: Scientists have discovered evidence of ancient river valleys and lake beds on Mars, suggesting that water once flowed on the planet's surface. The mystery lies in understanding where the water came from and how it disappeared over time.
The Great Red Spot of Jupiter: The Great Red Spot is a gigantic storm on Jupiter that has been observed for centuries. Despite extensive studies, its exact nature and the reasons for its longevity remain uncertain.
The existence of a ninth planet: Astronomers have proposed the existence of a ninth planet in our solar system, often referred to as "Planet Nine." Its presence is inferred from the gravitational influence it appears to have on other distant objects.
The composition of Saturn's rings: Saturn's rings consist of countless particles of ice and rock, but the origin of these rings and the mechanisms that keep them stable are not fully understood.
The nature of dark matter: Dark matter is an invisible substance that is thought to make up a significant portion of the universe's mass. Its presence is inferred from its gravitational effects, but its composition and fundamental nature are unknown, presenting a major mystery in astrophysics.
The internal structure of Uranus and Neptune: Uranus and Neptune are ice giants with complex internal structures. Determining the composition and distribution of their various layers
The source of recurring methane spikes on Mars: Scientists have detected occasional spikes in methane levels in Mars' atmosphere. These spikes suggest the presence of active processes on the planet
The nature of the subsurface oceans on icy moons: Moons like Europa (around Jupiter) and Enceladus (around Saturn) are believed to have subsurface oceans beneath their icy crusts.