In our solar system, earth. God put earth right where its not too hot or too cold. Humans are very fragile when it comes to temperature. All the others are either too cold or too hot. Also earth is the only one that we know of that has an atmosphere in which we can breath.
Yes, gravity pulls a spacecraft towards the nearest planet because objects with mass attract each other. The gravitational force between the spacecraft and the planet causes the spacecraft to be pulled towards the planet as it travels through space.
The Magellan spacecraft mapped the cloud-shrouded planet Venus with radar.
A spacecraft without people on board is called an unmanned spacecraft or a robotic spacecraft. These types of spacecraft are operated remotely from Earth or operate autonomously.
When spacecraft like the Hubble telescope enter a planet's orbit, it is lifted by a rocket. Once it enters the orbit, the rocket drops away and the spacecraft is projected through the planet's orbit.
Pluto has yet to be visited by a spacecraft because it is so far away.
Voyager 2
Mars is the planet that is most studied besides Earth. Scientists have been sending spacecraft to orbit, land, and rove on Mars for decades, gathering valuable data on its geology, climate, and potential for hosting life.
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No spacecraft has visited all the planets.
The First spacecraft was the MESSENGER. The First spacecraft was the MESSENGER.
Yes, gravity pulls a spacecraft towards the nearest planet because objects with mass attract each other. The gravitational force between the spacecraft and the planet causes the spacecraft to be pulled towards the planet as it travels through space.
The Mariner spacecraft landed on the planet Mars, and the Apollo spacecraft landed on the moon.
Strictly speaking, Saturn doesn't have a surface that can be landed on, so there have been no spacecraft landings on Saturn. Pioneer 11 and Voyagers 1 and 2 have done flybys of Saturn.
A moon or artificial object orbiting around a planet is called a satellite.
The Magellan spacecraft mapped the cloud-shrouded planet Venus with radar.
Saturn
yes