Look up at the night sky on a clear evening. Stars sparkle against the black void. You might wonder: where does Earth end and space start? Space marks the vast region beyond our planet’s atmosphere. It holds almost no air, just scattered particles. Planes fly in the air below. Rockets push through to reach it. … Read more
You gaze up at the night sky. Dots of light sparkle against the dark. What are those twinkling things? Stars? Planets? Something wilder? Space holds wonders beyond imagination. Main objects found in space include familiar ones like planets and moons in our solar system. Then come stars that light everything up. Galaxies swirl with billions … Read more
Imagine a single grain of sand on a beach. Now picture Earth as that beach, crammed with trillions of grains. The universe dwarfs even that scale. Our observable universe, the slice we can see, spans about 93 billion light-years across. Yet the full universe might stretch forever beyond our view. You wonder: How do we … Read more
Imagine floating in total silence. Nothing surrounds you, just endless black. No air rushes past. No sound echoes. That’s space, a near-perfect vacuum. Earth’s atmosphere holds air tight because gravity pulls it close. Space lacks that pull in most places. Matter spreads thin, about 5.9 protons per cubic meter on average. So, space stays empty. … Read more
Astronomers spot galaxies billions of light-years away using telescopes right here on our planet. Yet Earth’s atmosphere blurs that view like heat waves over a hot road. It blocks key wavelengths too. You might wonder how they pull off sharp images of stars and planets anyway. Scientists use powerful ground telescopes, smart fixes for air … Read more