The invention of the telescope was an important step for modern astronomy. It helped observe stars and planets. Our Earth orbits the Sun, along with seven other planets that constitute the solar system. Many comets also orbit the Sun. The entire solar system is only a small part of the Milky Way galaxy.
Heliocentric comes from the Greek word “helios”, meaning Sun. The Sun is the center of the solar system. All the planets in the solar system orbit around the Sun.
Neap tides are weak tides. They occur when the sun’s and moon‘s gravitational pull are perpendicular to each other.
In our solar system, eight planets orbit the Sun. But there are other round bodies orbiting the Sun. These bodies are like planets but much smaller. They are called planetoids. The largest asteroids or dwarf planets are called a planetoids.
a massive ball of gas in outer space that gives off heat, light, and other forms of radiation
Planet Mars is able to clear the neighborhood around its orbit. However, Pluto does not have enough mass to clear its neighborhood. Pluto is classified as a dwarf planet.
The region past Neptune's orbit is called Kuiper belt. Many comets are seen here.
The nebular hypothesis suggests that our solar system formed from a huge cloud of dust and gases called a nebula.
What is a system? Anything that is organized and predictable is a system. The orbits of the planets and the position of the Sun are fixed – they do not change. We always know where the planets and Sun will be. This system is called solar because the planets are controlled by the Sun’s gravity.
A sun is any star around which planets revolve. A star goes through many stages in its life cycle. It starts life from a nebula, evolves into a protostar, then a main sequence star. Depending on its mass, it can then become a red giant or a red super giant.
The pull of gravity on the Earth and on the Moon is different. Earth is much larger than the moon. So, its mass is greater and the gravitational pull here is 9.8 m/s2. But on the Moon, the gravitational pull is only 1.6 m/s2. So, an object will weigh less on the Moon than it does on Earth.
The Moon is a natural satellite that revolves around Earth. Mars has two moons, Phobos and Deimos, while Jupiter has over 63 moons. The most prominent of these are Ganymede, lo, Europa, and Callisto. Satellites launched into space orbit around Earth are man-made moons.
Take a spoon and tie it to a two-foot length of string. Hold the string in your hand as you spin around in one place. The spoon follows the same path no matter how many times you spin. The path of the spoon around you is called its orbit. Earth and the other planets in the solar system go around the Sun in fixed orbits.
String tides are strong tides. They occur when the sun’s and moon‘s gravitational pull are in line with each other.
Tides occur due to the gravitational pull of the Sun and the Moon. At spring tide, the Sun and the Moon are in a straight line with each other. During this time, Earth experiences the highest high tides and the lowest low tides. At neap tide, the Sun and the Moon are at a 90 degree angle with each other. During this time, tides have the smallest range.

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Frequently Asked Questions

What is a crossword?

Crossword puzzles have been published in newspapers and other publications since 1873. They consist of a grid of squares where the player aims to write words both horizontally and vertically.

Next to the crossword will be a series of questions or clues, which relate to the various rows or lines of boxes in the crossword. The player reads the question or clue, and tries to find a word that answers the question in the same amount of letters as there are boxes in the related crossword row or line.

Some of the words will share letters, so will need to match up with each other. The words can vary in length and complexity, as can the clues.

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Crosswords can use any word you like, big or small, so there are literally countless combinations that you can create for templates. It is easy to customise the template to the age or learning level of your students.

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Once you’ve picked a theme, choose clues that match your students current difficulty level. For younger children, this may be as simple as a question of “What color is the sky?” with an answer of “blue”.

Are crosswords good for students?

Crosswords are a great exercise for students' problem solving and cognitive abilities. Not only do they need to solve a clue and think of the correct answer, but they also have to consider all of the other words in the crossword to make sure the words fit together.

If this is your first time using a crossword with your students, you could create a crossword FAQ template for them to give them the basic instructions.

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We have full support for crossword templates in languages such as Spanish, French and Japanese with diacritics including over 100,000 images, so you can create an entire crossword in your target language including all of the titles, and clues.