Mars scientists found water on. Mars
Astronomers believe that Mars has water, primarily in the form of ice, and there is evidence of seasonal liquid water flows on its surface. Additionally, scientists have detected water vapor in the atmospheres of several exoplanets and the icy moons of Jupiter and Saturn, such as Europa and Enceladus, which also harbor subsurface oceans.
Astronomers believe Triton may have been a planet that was captured by Neptune because it orbits in the opposite direction of Neptune's rotation and is tilted compared to the planet's other moons. This suggests it did not form in place with the other moons of Neptune, but rather was captured later in the planet's history.
No, not all astronomers consider Pluto a planet. Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union, leading to debate among scientists about its classification. Some astronomers argue that Pluto does not meet all the criteria to be considered a full planet.
Astronomers began searching for Planet X to explain discrepancies in the orbits of Uranus and Neptune. Observations indicated the presence of an unknown massive celestial body affecting the orbits of these planets.
Astronomers believe that Mercury might be the core of what used to be a much larger planet due to its large metallic core relative to its size and lack of a substantial mantle. This hypothesis suggests that a collision with another large body stripped away much of its outer layers, leaving behind the dense core that we observe today.
Astronomers believe there is a good chance that Europa, one of Jupiter's moons, contains liquid water under its icy crust. The moon's subsurface ocean is considered one of the most promising places in the solar system to find extraterrestrial life.
Earth
Mars
It is no longer classified as a planet as astronomers now believe its a asteroid that got pulled into an orbit with our sun. Some also believe it to be a misplaced moon of Neptune.
Astronomers have decided that Pluto does not meet the definition of a planet.
Most planets in the Solar System have been found or speculated to have water. But at the moment only Earth is known to have water in the liquid state. Both polar caps on the planet Mars are known to have frozen water. It is also speculated that under the crust of some moons in the outer solar system, liquid H2O oceans may exist. Outside the solar system no one knows, but just recently astronomers have discover the exo-planet Gliese581g, which seems to be the right temperature that might support the existence of liquid water on its surface.
Neptune
Astronomers think Pluto is a dwarf planet. And they're right.
Astronomers believe that Mars has water, primarily in the form of ice, and there is evidence of seasonal liquid water flows on its surface. Additionally, scientists have detected water vapor in the atmospheres of several exoplanets and the icy moons of Jupiter and Saturn, such as Europa and Enceladus, which also harbor subsurface oceans.
Astronomers believe Triton may have been a planet that was captured by Neptune because it orbits in the opposite direction of Neptune's rotation and is tilted compared to the planet's other moons. This suggests it did not form in place with the other moons of Neptune, but rather was captured later in the planet's history.
pluto
No, not all astronomers consider Pluto a planet. Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union, leading to debate among scientists about its classification. Some astronomers argue that Pluto does not meet all the criteria to be considered a full planet.