What is the Smallest Planet in Our Solar System?

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I wonder… What is the smallest planet in the Solar System? That’s one of the questions that might come to the minds of all those kids out there and one which they usually ask their parents about to try and get an answer for.

The smallest planet in our Solar System is Mercury. The surface of Mercury is very similar to our moon. It has a very barren, rocky surface covered with many craters. Being so close to the Sun, the daytime temperature on Mercury is scorching – reaching over 400 Degrees Celsius. At night however, without an atmosphere to hold the heat in, the temperature’s plummet, dropping to -180 Degrees Celsius.

Since Earth is where we tend to live, it will always be measured among the other planets found in the solar system. When it comes to the smallest planet which is Mercury, it is important to mention that Mercury is actually 20 times less massive than Earth and its diameter is about two and a half times smaller. Mercury is closer in its size to the moon that it is to Earth.

An interesting fact is that Mercury has an extremely thin atmosphere, meaning that there is no wind or weather to speak of.

From the pictures which were sent before by those spacemen, there are some appearances translated to meanings here on Earth. First of all, these pictures might show that some volcanic action might have been caused on Mercury when it was formed and secondly, the surface shows some kind of “wrinkling” on the surface which is believed to be caused due to the intense pressures of the planet.

Even though Mercury is known with its high pressure, it is still not the one to be named as the hottest but instead it is given the title of having the largest metallic core of all the planets, making up 75% of the whole planet. According to science, this molten core is because some of the surface was burned off when it was forming, due to being very close to the sun, there is another scientific theory which says that Mercury was actually larger in its size at the beginning but was hit by another planet and was reduced to this size.

Teaching the kids about the planets in the solar system and bringing them such information is not always easy, one will need to choose the right learning and education resources which they will love and find interesting to watch. This is what we at LearningMole are trying to do and in addition to knowing about the smallest planet in the solar system, you could teach your kids about the biggest planet through letting them watch this video ( and also open this link for them so they could know more about the planets and their facts in general (

Our journey for bringing different learning resources for the kids and for supporting parents with the homeschooling life they are willing to start. There are three different fields we help the kids with, they are science, math, crafts and cooking, and in every single one of them, you will find the resources you are searching for.

If we are referring to the facts’ part then there are different links which you could check on our channel and which will provide you with several videos that are all informative for the kids. One example is the dinosaur facts which you could get through this link ( the facts about viking longships ( and the general facts about viking as well ( you could also find a link that will teach your kid about the tsunami and its facts ( or else find some facts about snails if your kid is more interested about animals ( you will most probably find everything you might be searching for, just choose the right video for the right age.

Are you still wondering about the smallest planet in the solar system? We think that by now you know what your kids should be knowing and what you are supposed to show them in order for them to get this needed kind of information about the solar system and the planets.

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Easy to follow activities will support you and your child to learn and practice new concepts as well as enjoy spending time together. Help your child to progress and explore and most importantly – have fun!


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