SPACE

Expanding Universe: The universe is expanding, and galaxies are moving away from each other. This phenomenon was first observed by astronomer Edwin Hubble in the 1920s.
The Milky Way: Our galaxy, the Milky Way, is estimated to contain 100 to 400 billion stars and is about 100,000 light-years in diameter.
Black Holes: Black holes are regions in space where gravity is so strong that nothing, not even light, can escape. They form when massive stars collapse under their own gravity.
Mars’ Moons: Mars has two small moons, Phobos and Deimos, which are thought to be captured asteroids from the asteroid belt.
Temperature Extremes: Space is incredibly cold, with an average temperature of about -270.45 degrees Celsius (-454.81 degrees Fahrenheit), just above absolute zero.
The Great Wall: The Hercules-Corona Borealis Great Wall is the largest known structure in the universe, a massive galaxy supercluster complex stretching over 10 billion light-years.
Water in Space: Scientists have discovered water in various forms throughout the universe, including ice on Mars and vapor in the atmospheres of distant exoplanets.
Time Dilation: Due to the effects of relativity, time passes differently in space. Astronauts on the International Space Station age slightly slower than people on Earth due to their high-speed orbit.