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If this is a homework question, then I'm afraid that your teacher is wrong.
The answer they are looking for is Mercury - but they are wrong, and have been since about 1965.
Mercury was originally believed to be tidally locked, but radar observations showed that it has a 3:2 resonance. Eg. It rotates 3 times for every revolution. 58 days for a rotation (day), and 88 for a revolution (year). So 88/58 = about 1.5 or 3/2.
The reason this happened is that earlier observations had to rely on Mercury being visible. And thus observations always "seemed" to be in the same place, so Mercury must be tidally locked, but failed to take into account the Earths rotation at the same time.
See related link for more information
What else can I help you with?
Why does the sun shine on only one side of the earth at a time?
As in realestate : location, location, location.
Is Venus tidally locked to the Sun?
Ah, let's paint a little picture of Venus for you now. The lovely Venus is almost tidally locked to the Sun, meaning it rotates so slowly compared to its orbit that one day is longer than one year. Just like how we can take our time with each brushstroke, Venus takes its time dancing in rhythm with the Sun. Quite a beautiful dance, wouldn't you say?
Is Earth tidally locked with the Sun?
No, Earth is not tidally locked with the Sun. Tidal locking occurs when one side of a celestial body always faces its parent body, like the Moon does with Earth. Earth rotates on its axis, causing day and night, and does not have a permanent day or night side facing the Sun.
How would a planet 1.6 million miles from the sun look?
A planet located 1.6 million miles from the sun would appear extremely close to the sun from its perspective, possibly lost in the sun's glare. The planet would likely experience extremely high temperatures and intense solar radiation, making it challenging for life as we know it to survive. The planet might also be tidally locked, with one side always facing the sun.
Is there a tidal lock between the sun and neptune?
No. Neptune is too far from the sun to have become tidally locked. Neptune rotates quickly, as do the other gas giants in the solar system.
Would the length of the day be shorter if earth were in an orbit closer to sun?
No, the distance of earth from the sun is independent of day length which has to do with the rotational rate of the earth about its axis, except under extreme cases. If the earth where sufficiently close to the sun it would become tidally locked meaning that the same side of the earth would always face the sun. This is the case with mercury which is tidally locked with the sun and the moon which is tidally locked with the earth. The size of the orbit does however determine the length of an earth year. Being the earth's orbit is very nearly circular I will refer to it as a circle for clarity. A smaller circle means a shorter year (ie less time to make a complete trip around the sun often referred to as an orbital period) and a larger circle means a longer year.
Does mercury demonstrate gravitational locking?
No. Mercury was once believed to be tidally locked to the sun, meaning it rotates once for every orbit so that the same side always faces the sun. Closer observation found that Mercury is not tidally locked.
What is the problem caused when planets do not revolve?
You probably mean 'rotate'. If a 'planet' is not revolving (orbiting) then it cannot be a planet and would eventually crash into its star. There is no problem if a planet is not rotating on its axis, but you will need to carefully define what kind of rotation you mean. If a planet has no sidereal rotation (a situation that would be unlikely if not impossible) then from the perspective of the sun it orbits, it will have the apparentrotation of once per orbit. If the planet is tidally locked with its sun (a more likely scenario) then from the sun's perspective there is no rotation, but there is one sidereal rotation per orbit. A body orbiting a sun or other body will 'rotate' in one way or the other.
Is the sun the only planet that starts with a s?
NO, Saturn is the only planet. The sun is not a planet.
How would life be different around a red dwarf?
If we lived on a planet orbiting a red dwarf we would be bathed in orange-red light rather than the yellow-white light of our real sun. In order to sustain earthlike temperatures our planet would have to orbit much closer to the sun and would be tidally locked with one side always facing the sun. As a result the sun would never rise or set but would remain fixed in the same spot in the sky. The side of the planet facing away from the sun would be frozen in perpetual darkness.
How do tidally locked planets rotate in relation to their orbit around their host star?
Tidally locked planets rotate in a way that one side always faces their host star, while the other side remains in constant darkness. This means that the rotation of the planet is synchronized with its orbit around the star.
Do revolution and rotation have the same period?
No, when an object is revolving it is either: 1.following a fixed orbital path around another object (the Earth around the Sun), or 2.rotating on an axis (the Earth does both). When the object makes one full trip around it's orbit or one full turn on its axis that is ONE revolution. One revolution of the Earth around the Sun is a year. One revolution of the Earth about its axis is 24 hours.
