The names Marius proposed for the moons in 1614 (suggested to him by a fellow astronomer, Johannes Kepler) are the ones we use today —
Io
, Europa, Ganymede, and Callisto. Io is the most volcanically active body in the solar system. Its surface is covered by sulfur and lava in many colorful forms.
How many moons are geologically active?
Geologically recent volcanic activity is not as widespread. Based upon observations from Earth and from space vehicles, only
four bodies
in the solar system have confirmed volcanic activity. These are 1) Earth; 2) Io, a moon of Jupiter; 3) Triton, a moon of Neptune; and, 4) Enceladus, a moon of Saturn.
Is the moon Callisto geologically active?
The surface is about 4 billion years old and it's been pummeled, likely by comets and asteroids. Because the impact craters are still visible, scientists think
the moon has little geologic activity
—there are no active volcanoes or tectonic shifting to erode the craters.
What moon has 300 active volcanoes?
Jupiter's fifth moon,
Io
, is the most volcanically active body in the solar system. Plumes of sulfur spew upward as high as 190 miles (300 kilometers).
Is Callisto a dead moon?
Callisto is a large moon orbiting Jupiter. It has an ancient, cratered surface, indicating that
geological processes could be dead
. However, it may also hold an underground ocean.
Can humans live on Callisto?
Callisto has a very thin atmosphere, is thought to contain an ocean, and is therefore another
possible contender for life beyond Earth
. However, its distance from Jupiter means it doesn't experience such a strong gravitational pull, so it's not as geologically active as the other Galilean moons of Io and Europa.
What planet has lava?
Io
is the most geologically active world in the Solar System, with hundreds of volcanic centres and extensive lava flows. Lava worlds orbiting extremely closely to the parent star may possibly have even more volcanic activity than Io, leading some astronomers to use the term super-Io.
What are the 4 Galilean moons?
A comparison “portrait” of Jupiter's four Galilean moons
Io, Europa, Gany- mede, and Callisto
, each with different characteristics.
Which planet has the longest year?
Given its distance from the Sun,
Neptune
has the longest orbital period of any planet in the Solar System. As such, a year on Neptune is the longest of any planet, lasting the equivalent of 164.8 years (or 60,182 Earth days).
Which moon is considered likely to have a deep?
| Question Answer | Which moon is considered likely to have a deep, subsurface ocean of liquid water? Europa | The Huygens probe took numerous pictures as it descended to Titan's surface in 2005. What did the pictures show? features or erosion, including what appeared to be dry river valleys and lakebeds |
|---|
Is there volcanic activity on the Moon?
Fragments of volcanic eruptions were discovered in the lunar soil
, which was delivered to the Earth by “Apollo” spacecrafts. … On the images of the visible side of the Moon obtained with the help of the LRO, evidence is provided that volcanic eruptions on its surface were possible even a few million years ago.
Is there still lava on the Moon?
The Moon has been volcanically active throughout much of its history, with the first volcanic eruptions having occurred about 4.2 billion years ago. … Today,
the Moon has no active volcanoes
even though a significant amount of magma may persist under the lunar surface.
Can you land on Callisto?
Callisto is the second largest and most distant of Jupiter's Galilean moons. It is colorful and spotty in appearance. Callisto is included in the Planets Expansion DLC. Like Ganymede and Io, Callisto's high gravity
makes landing
and return from the surface difficult with low thrust engines.
Which moon is the oldest?
| Discovery | Average orbital speed 8.204 km/s | Inclination 2.017° (to the ecliptic) 0.192° (to local Laplace planes) | Satellite of Jupiter | Group Galilean moon |
|---|
Does Jupiter's moon have life?
Europa is the fourth largest moon of Jupiter.
Scientists think that life may exist on Europa
because there is evidence that liquid water may exist beneath its icy surface. … So, there may be lakes and oceans of liquid water on Europa. Water is a major requirement for life.
