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No satellites are known to orbit Mercury or Venus.
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Does every planet have a moon?
No. Neither Mercury nor Venus have any moons.
Why do inner planets have less moons then outer planets?
Because when they are close to the sun first of all they are are smaller so if they had a moon the moon would have to be kinda small. And also the planets close to the sun are made to be able to get to high temperatures. Earth can't get satellites to Mercury and a moon is related to the satellites and the moon would burn up in the heat. All mass has gravity. The inner planets cannot "hang on" to their moons due to their lack of mass, therefore they are unable to overcome the suns gravitational affect on the moons which would pull them into the sun. The outer planets can "hang on" to their moons and attract more because of their mass (therefore gravity). The distance from the sun has less of an impact on these moons, therefore, the sun cannot pull any of the moons away from the outer planets. Also, the outer planets are "kind of" moon magnets due to their gravitational pull.
Can astronauts see other planets from the moon?
Yes. Since the moon occupies essentially the same place in the solar system as Earth does its sky offers pretty much the same view. In fact the moon's lack of an atmosphere likely means that you could see the planets even more clearly than you can from Earth.
Jupiter's gravity compared with earth?
While the surface gravity of Saturn is 10.44 meters per second squared, the Earth's gravity is 9.81 meters per second squared. Making a comparison of surface gravity, Saturn's gravity is higher than the Earth's. So if you weighed 100 pounds on Earth, you would weigh approximately 106.4 pounds on Saturn.
Why are terrestrial planets smaller and denser?
Terrestrial, or mostly solid, planets are much denser than Jovian, or gas, planets. This is because they, as you may have noticed, are much closer to the Sun. They actually used to have gas surrounding them, though because of the Sun's powerful solar rays, were blown off of their surfaces. Solar rays are also gradually affecting the gas planets. Each year, 2 centimeters of Jupiter's surface is blown off.
The three smallest major planets in the solar system all lack?
The smallest major planets in the solar system both lack a moon. They are Mercury and Venus. Pluto used to be a major planet and was thought to have no moon. However, it was downgraded to a dwarf planet in 2006 and has several moons.
Does every planet have a moon?
No. Neither Mercury nor Venus have any moons.
Jovian planets lack moons?
No, they have lots of moons.
What planets lack moons?
Mercury and Venus have no moons.
What planet has no moons?
Bothe mercury and Venus have no known moons. All of the other planets in ku solar system have at least one moon, the larger gas giant planets have many moons. It's partly due to the lack of debris in the inner part of the solar system and the fact that Venus and mercury are not very big, so can't easily capture or hold a moon.
What does mercury and venus lack that the outer planets have?
Moons
Why other planets are dangerous and earth is not?
Earth is dangerous. However there are many factors which need to be answered and lets look at our solar system first. For Humans the following factors need to be taken into account to survive without any protection Lack of Oxygen- all other planets and moons lack oxygen Lack of liquid Water- all other terrestrial planets lack liquid water (currently) however it may be present on some moons high or low temperatures (down to 3 degrees Kelvin and upwards to 700) high radiation and lack of a magnetic sphere poisonous or corrosive atmospheres Other solar systems which meet human habitation requirements might have toxic plants or biota.
Why Venus have no satellite?
Since Earth's Moon was likely formed from a chance collision, the formation of moons may not have been a stable process in the inner solar system. Any moons that formed around Venus or Mercury could have been swept away by the stronger gravity of the Sun, as might smaller moons around Earth. If Mercury or Venus ever had satellites, they were lost long ago.
Why some planets moons have atmospheres and others don't?
All of the planets except for Mercury have substantial atmospheres. Mercury is the least massive of the planets and has the weakest gravity, which makes it hard to hold on to gasses. It is also the closest planet to the sun, and the intense heat will tend to drive away any gasses that would collect around the planet. The moons of the solar system all have weaker gravity than Mercury does, so most are unable to hold onto an atmosphere. Titan, the largest moon of Saturn, is the only moon in the solar system to have a substantial atmosphere. While it has weaker gravity than Mercury it is much farther from the sun and much colder, which makes it harder for gasses to escape. Other large moons, even cold ones may lack atmosphere for a few reasons that could have to do with the compositions of the moons or events in the past that may have driven an atmosphere away.
Why do inner planets have less moons then outer planets?
Because when they are close to the sun first of all they are are smaller so if they had a moon the moon would have to be kinda small. And also the planets close to the sun are made to be able to get to high temperatures. Earth can't get satellites to Mercury and a moon is related to the satellites and the moon would burn up in the heat. All mass has gravity. The inner planets cannot "hang on" to their moons due to their lack of mass, therefore they are unable to overcome the suns gravitational affect on the moons which would pull them into the sun. The outer planets can "hang on" to their moons and attract more because of their mass (therefore gravity). The distance from the sun has less of an impact on these moons, therefore, the sun cannot pull any of the moons away from the outer planets. Also, the outer planets are "kind of" moon magnets due to their gravitational pull.
Why is earth the only planet humans can live on?
Given the immense number of planets in the Universe it would be unsupportable to state that "only the Earth" can support human life. In this solar system no other planet has surface conditions which would allow exposed humans to live. This does not preclude humans living in contained communities or in a terraformed environment.
Can astronauts see other planets from the moon?
Yes. Since the moon occupies essentially the same place in the solar system as Earth does its sky offers pretty much the same view. In fact the moon's lack of an atmosphere likely means that you could see the planets even more clearly than you can from Earth.
