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Why Two Planets Have No Natural Satellites

You may be wondering why two planets have no natural satellites. Moons are simply extraterrestrial objects that orbit around other planets. The two innermost planets Mercury and Venus are the only known planets without moons. The outermost planets such as Jupiter and Saturn have many moons. Dwarf planets such as Pluto Ceres and Neptune have … Read more

Which of the Nine Planets is the Largest?

Of all the planets in our solar system which is the largest? Saturn Earth Neptune Jupiter and Uranus all have different sizes and mass. So how do you know which is the largest? The answer is a combination of factors but in general the largest planet is the Earth. In this article we will cover … Read more

Which is the Correct Way to Say ‘This’?

In the English language which is the correct way to say ‘this’? It can also be ‘that’. If you’re unsure read our article on which is the correct way to say ‘this’. We will also discuss how to use a non-restrictive clause in sentences. Finally let’s talk about the relative clauses which are inserted at … Read more

Which Two Planets Have Only One Moon?

Have you ever wondered which two planets have only one moon? The answer may surprise you. Here you will learn which two planets are most like Earth. They have similar orbits but are not as close to the Sun. This would normally give them a higher chance of having a moon. But Venus does not … Read more

Which Two Planets Have No Moon?

You might wonder – which two planets have no moon? Mercury Venus Uranus and Neptune? In this article we will take a closer look at each planet to help you answer that question. You will learn what each one is best known for and which one is most similar to the other. Find out if … Read more

Which Planets Have a Solid Surface?

You may be wondering which planets have a solid surface. If so you can read on for more information. This article includes information about Earth Uranus and Neptune. It also includes information about Ganymede another moon of Jupiter. The answer to the question will surprise you! You may have never heard of this moon and … Read more

Which Planets Have We Visited Or Explored?

Have you ever wondered what it would be like to live on another planet? Whether you’d live on Mercury or Mars this article is for you! We’ve covered the most important planets in our solar system from Mars to Neptune. But which other planets have we visited or explored? Here are a few of them. … Read more

Which Planets Have Phases Like the Moon?

Did you know that Mercury Venus Mars and Earth all have phases similar to the Moon? And did you know that Saturn has moons too? You might be surprised to know that the Apollo astronauts were able to view Earth’s phases while on the Moon. So how do you find out which planets have phases … Read more

Which Planets Can Be Seen With the Naked Eye?

In this article we’ll talk about which planets are visible to the naked eye. Later this month the five naked-eye planets will reunite for an hour after sunset. Then over the next two weeks they’ll be visible again for a half-hour each night. Until then though you’ll have to look up from your computer screen … Read more

Which Force Causes Planets and Comets to Orbit the Sun?

You’ve probably heard that gravity is responsible for the motion of planets and comets but how does that work? We’ll look at two different forces involved: centripetal motion and Newton’s universal law of gravitation. What do these three forces have in common? Let’s explore them one by one. Which one is most important to our … Read more

The Asteroid Belt – The Difference Between Jupiter and Mars

In this article you will learn the differences between Jupiter and Mars the two largest planets in our Solar System. You will also learn the zones and sizes of the asteroids in the asteroid belt and the rates at which asteroids may impact Earth. In addition you will learn why it is so important to … Read more

How Do the Planets Rotate Around the Sun?

Most of the planets revolve around the sun counter-clockwise though some of them have an erratic or steep tilt to their orbits. Even those that have a steeper tilt tend to maintain elliptical orbits. For example Pluto’s orbit sometimes places it between Uranus and Neptune. Mercury’s orbit is only seven degrees tilted on its elliptical … Read more

Which Planets Can Never Be Seen at Opposition?

There are several factors to consider in determining which planets can never be seen at opposition. In this article we will talk about their geocentric longitudes appearance cycle and apparent stationary point. We will also look at their orbital declination. This information will help you determine the exact position of the planets during the opposition … Read more

What Invention Changed How We Think About Planets?

What invention changed how we think about planets? It could be Galileo’s telescope or Tycho Brahe’s telescope or it could be Hubble’s telescope. All were significant in changing the way scientists view the universe and they have impacted our understanding of space and our planets to this day. Discovering the moons of Jupiter with a … Read more

How to Remember the Planets

Here are a few ideas to help you remember the planets. Some of these ideas involve mnemonics (word association patterns) visual imagery rhymes and repetition. Try one or more of them! And don’t forget to use all of your senses! These techniques are proven to be effective! So start using them right now! You’ll be … Read more

How to Calculate the Distances to the Planets From the Sun

The distances to the planets are calculated using the Sun as the primary location point. This distance is often much greater than the distance to Earth but this is not always the case. Learn how to calculate the distances to the planets from the sun in this simple article. You’ll find out how the distances … Read more

How Often Do All the Planets Align?

In our lifetime how often do all the planets align? According to Michelle Nichols director of public observing at the Adler Planetarium in Chicago the alignment is rare and irregular. But we’ve got an early jump on the plants taking alignment: they’ve already started to take alignment. And the skywatcher’s calendar is already full of … Read more

How Much Do I Weigh on Other Planets?

The answer to the question ‘how much do I weigh on other planets’ will vary depending on the mass of the object the density of the planet’s atmosphere and the distance from its centre. If you’ve ever jumped high in the air while on the Moon you know that the Moon’s gravity is surprisingly strong … Read more

How Many Rogue Planets Are in the Milky Way?

Despite the hundreds of billions of stars that make up our galaxy astronomers still struggle to find the mysterious rogue worlds. Many of them are found in sets of planets like the solar system but not all of them orbit a star. A recent announcement by astronomer Bill Mroz reveals that the smallest rogue world … Read more