Top 10 questions children frequently ask about the Sun and how to answer them scientifically

Tell your child: The energy in the sunlight we see today originates from the Sun's core over 30,000 years ago. The sunlight travels through dense particles in a special state that forms the Sun and takes just 8 minutes to reach Earth. All the energy produced in this core area has to pass through many layers to reach the Sun's atmosphere before radiating into space as light or the kinetic energy of solar particles.

What you need to know: The speed of light (more generally, the speed at which electromagnetic radiation travels) in a vacuum, symbolized as c, is an important physical constant in many areas of physics. It has an exact value of 299,792,458 meters per second, as the meter unit of length is redefined based on this constant, and the standard second. The answer is correct, and the exact number is about 170,000 years. This is a shocking figure for many. As we know, light only takes about 8 minutes to travel from the Sun's surface to Earth, but before that, photons of light have to move from the Sun's core to its surface. This is a piece of knowledge that is difficult even for adults to grasp, but if you simplify the answer for your child, they will better understand the concept.

Tell your child: Thanks to the light and energy from this star, life on Earth has flourished. As one of the 100 billion stars in the Milky Way, it is perhaps the only star with a planet that supports life. However, we often mistakenly think that the Sun is stationary. In reality, it is moving very fast.

What you need to know: The Sun and the objects in its planetary system move at an incredibly fast speed of about 720,000 km per hour. Along with other planetary systems, it moves towards the center of the Milky Way. Despite its speed, it will take 230 million years to complete one full rotation around the Milky Way's center. Since your child is learning only basic concepts, using simple terms will help them understand much better.

Tell your child: Unlike the mild environment we have on Earth, our Solar System contains many areas with extreme temperatures. The Sun is a giant sphere of gas and fire, with extremely high temperatures. Its apparent brightness is 13 billion times greater than the star Sirius, the brightest in the night sky.

What you need to know: Clearly, the Sun is very bright, but do you know just how bright it really is? It is the brightest object we can see in nature, with an apparent brightness of -26.74. This brightness is 13 billion times brighter than Sirius, the brightest star in the night sky, which has an apparent brightness of -1.46. However, you cannot explain this to your child using terms like apparent brightness, as they may not fully understand those concepts. It's better to use specific examples in such cases. This way, your child can grasp the concept and use it to think about other planets.

Nói với bé: Các tia sáng Mặt Trời chiếu rọi từ phía sau những đám mây rõ ràng là một nguồn cảm hứng tuyệt vời cho những người thích hội hoa, từ những đứa trẻ mới cầm cọ, đến những họa sĩ tài ba. Tia sáng của Mặt Trời ẩn nấp sau những đám mây luôn là một thứ đẹp đẽ có sẵn trong tự nhiên.

Bạn cần biết rằng: Các tia sáng Mặt Trời chiếu rọi từ phía sau những đám mây rõ ràng là một nguồn cảm hứng tuyệt vời cho những người thích hội hoa, từ những đứa trẻ mới cầm cọ, đến những họa sĩ tài ba. Tia sáng của Mặt Trời ẩn nấp sau những đám mây luôn là một thứ đẹp đẽ có sẵn trong tự nhiên. Được tạo ra khi các đám mây che Mặt Trời nhưng không che hoàn toàn ánh sáng của nó, khiến các tia sáng Mặt Trời lọt ra và rực sáng cả vùng trời. Tuy vậy, trên thực tế những tia sáng ấy là những đường song song với nhau. Đây là hiệu ứng ảo giác quang học, điều cũng xảy ra như khi ta nhìn vào đường ray xe lửa từ gần đến xa. Chúng ta chưa cần phải đưa nhiều thông tin quá chi tiết về một chủ đề cho bé vì như vậy bé sẽ rất khó để hiểu hết. Thay vì như vậy, hãy nó thêm những kiến thức xung quanh chủ đề đó để bé cảm thấy thích thú hơn.

Tell the child: The Sun is, of course, an extremely hot star, but just how hot is it? NASA states that the Sun's core can reach up to 15 million degrees Celsius to sustain the fusion reactions happening there. The Sun's surface also reaches about 5,500 degrees Celsius, hot enough to make diamonds boil.

What you should know: Unlike the mild environment on Earth, our Solar System contains many areas with extreme temperature ranges. The Sun is a ball of gas and fire, with a core temperature of about 27 million degrees Fahrenheit (approximately 15 million degrees Celsius). The Sun's surface temperature can also reach 10,000 degrees Fahrenheit (around 5,538 degrees Celsius). Meanwhile, the "cosmic background temperature"—the temperature of space far enough away to escape the Earth's atmospheric temperature effects—varies around -455 degrees Fahrenheit (about -270.5 degrees Celsius). This is a challenging concept even for adults, but if you explain it in simpler terms, children will be able to grasp the idea more clearly.

Tell the child: The Sun is in its middle age. At 4.6 billion years old, the Sun is considered middle-aged compared to its lifespan, and it is still quite young compared to other stars. As part of the first-generation stars, it belongs to a group of relatively young stars.

What you should know: The Sun is estimated to be in its middle age. With an age of over 4.6 billion years, the Sun is considered a “middle-aged” yellow dwarf star — meaning it has lived more than half of its life. As a part of the first-generation stars, it is still relatively young. Scientists believe the Sun will continue to exist for a long time, but in about 6.5 billion years, it will enter its phase of destruction. There’s no need to overwhelm the child with too many details, as that might be hard for them to understand. Instead, you can share more general knowledge on the topic to keep them interested and curious.

Tell the child: Once the Sun has consumed all its available hydrogen, it will begin to burn helium. This process will last for around 130 million years or more. During this phase, it will swell and engulf the surrounding planets, such as Mercury, Venus, and Earth. The Sun will transform into a red giant.

What you need to know: A red giant star is a massive, luminous star with low to medium mass, in the final stages of its evolutionary journey. The core’s material becomes electron-degenerate and highly compressed, causing the outer atmosphere to expand and thin. This expansion lowers the surface temperature, sometimes dropping below 5,000 K. Red giants typically appear in yellow or red colors, including K and M spectral types, as well as S-class and most carbon stars. The Sun will eventually expand into a red giant, consuming the surrounding planets such as Mercury, Venus, and Earth. Research in space can often be complex, so simplifying the concepts and adding more surrounding details is the best approach.

Tell the child: The Sun is a very large yellow dwarf star. Even though its radius is about 695,508 km, much smaller than most other stars, it is still massive when compared to Earth. Moreover, the Sun plays a crucial role as a gigantic nuclear reactor, emitting light and energy across the Solar System, reaching planets, moons, comets, and asteroids.

What you need to know: The Sun is indeed a very large yellow dwarf star. While its radius is only about 695,508 km—smaller than most other stars—when compared to Earth, it is enormous. This star makes up 99.8% of the total mass of the Solar System and weighs 332,946 times more than Earth. If possible, we could fit 1 million Earths inside the Sun. When considering surface area, it spans approximately 2.347 billion square miles. However, you can’t explain such concepts to children, as they may not fully grasp these numbers. It's best to use concrete examples in such cases to help the child understand and think critically about other planets as well.

Tell the child: Nowadays, we all know that everything in the Solar System, including Earth, moves around the Sun. The Sun, being the center of this system, is why it is called the Solar System. The Sun's mass keeps everything in orbit around it, ensuring they follow their paths. It wasn't until the 16th century that people learned Earth revolves around the Sun and not the other way around.

What you need to know: It wasn’t until the 16th century that people discovered Earth revolves around the Sun, not the other way around. Before the 16th century, the entire world believed that the universe revolved around Earth, which was known as the geocentric model. The heliocentric theory, with the Sun at the center, began to emerge and spread after Copernicus publicly presented it. You don’t need to overwhelm your child with too much detail about this topic, as they may find it difficult to understand. Instead, add some related context to make the topic more interesting for them.

Tell the child: For centuries, the vast distance between Earth and the Sun has been a topic of study for astronomers. Many notable figures have contributed to the quest for an answer. It wasn’t until 1960, with the development of spacecraft and radar, that we were able to determine the exact distance from Earth to the Sun. Scientists concluded that the Sun is very far from Earth, about 20 times the distance from Earth to the Moon.

What you need to know: The Sun is located about 149,600,000 km away from us. This means if you were to drive non-stop at 100 km/h, you would reach the Sun in about 177 years. Even a commercial airplane flying at 885 km/h would take 19 years to cover the same distance. When it comes to measuring distances within the Solar System, astronomers use the Astronomical Unit (AU), which represents the distance from Earth to the Sun. In this case, 1 AU is the distance from the Sun to Earth. Explaining this concept to your child with physical terms might be too complex, so consider telling a story to make it easier for them to understand.