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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

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

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 of the three most distant extrasolar planets does Pluto most resemble? This question might come as a surprise since Pluto is the most distant planet from Earth. However it has been the subject of much discussion. After all the other two planets are even farther away! To answer this question we’ll look at what … Read more

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

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

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

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

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

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

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

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

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

In July 2021 humans discovered 4424 exoplanets with another 7576 candidates awaiting confirmation. To qualify as a planet an object must meet three criteria: it must be in direct orbit around a star be massive enough to crush other material in its neighborhood and have cleared the area of its orbit of other matter. Dwarf … Read more

If you’ve ever wondered how many planets have rings you’re not alone. Saturn is not the only ‘giant’ planet with rings. Neptune and Uranus also have rings but scientists don’t know how many they all have. It’s thought they range from 500 to a thousand. Jupiter however has four known rings. And scientists don’t even … Read more

How many planets in Star Wars are there? Those that we can identify as inhabited are Yavin Prime Alderaan Tatooine and Coruscant. This article will answer these questions and more. In addition we will explore how many moons are present on each planet and how many there are on each planet. There are many more … Read more

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

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

The Greeks’ answer to the question How did the ancients reconcile the observed motions of the planet with an unmoving Earth is a fascinating one. They used observational astronomy which focuses on the observed motions of the planets and the heavenly bodies. However their answer was also incomplete. Observations also require periods and rotations. Observational … Read more