The universe is a big and mysterious place. There are so many questions we still don't have answers to!
One day, our sun will die, but that won't happen for a very long time. Scientists are already thinking about how humans could survive if that happens.
In space, no one can hear you play guitar. That's because sound needs air to travel, and there's no air in space!
We don't know if there's life on Mars or other planets yet, but scientists are always looking for signs.
Big meteors hitting Earth are very rare, but it's possible. That's why scientists watch the sky carefully.
Believe it or not, the animal that causes the most human deaths is the mosquito!
There are billions and billions of stars and planets in the universe. It's hard to count them all!
If aliens came to Earth, we don't have an official plan to greet them. But many people have ideas about how we could say hello!
The universe is full of amazing things to learn about!

If you want to stay ________(23) and fit as a teenager, regular exercise is key. Many experts believe that if young people ________(24) for just 30 minutes a day, they would feel much better. For instance, if you went for a jog or a bike ride after school, you might have more energy for homework.
Some say that if schools offered more sports activities, students would be more active. Others think that if parents encouraged their kids to play outside more, it would help ________(25) screen time.
If you don't like traditional sports, there are many ________(26). You could try dancing, skateboarding, or even yoga. If you found an activity you enjoyed, you'd be more likely to stick ________(27) it.
Remember, if you start good habits now, they could last a ________(28). What do you think? If you could choose any sport or exercise to try, what would it be? Even small changes can make a difference. If you move a little more each day, you'll soon feel the benefits!