HERE ARE 20 INTERESTING FACTS ABOUT SPACE:
1. *THE UNIVERSE IS STILL EXPANDING*: SCIENTISTS HAVE OBSERVED THAT THE UNIVERSE IS CONTINUING TO EXPAND AT AN ACCELERATING RATE.
2. *THERE ARE MORE STARS THAN GRAINS OF SAND*: THE NUMBER OF STARS IN THE UNIVERSE IS ESTIMATED TO BE GREATER THAN THE NUMBER OF GRAINS OF SAND ON ALL THE BEACHES ON EARTH.
3. *SPACE IS NOT COMPLETELY EMPTY*: SPACE CONTAINS VARIOUS FORMS OF MATTER AND ENERGY, INCLUDING GAS, DUST, AND RADIATION.
4. *THE TEMPERATURE OF SPACE IS NOT ABSOLUTE ZERO*: THE TEMPERATURE OF SPACE VARIES FROM PLACE TO PLACE, WITH SOME AREAS REACHING TEMPERATURES OF NEAR-ABSOLUTE ZERO.
5. *BLACK HOLES HAVE NO HAIR*: BLACK HOLES ARE CHARACTERIZED ONLY BY THEIR MASS, CHARGE, AND ANGULAR MOMENTUM, WITH NO OTHER "HAIR" OR FEATURES.
6. *THE ANDROMEDA GALAXY IS APPROACHING US*: THE ANDROMEDA GALAXY, OUR NEAREST MAJOR GALACTIC NEIGHBOR, IS CURRENTLY MOVING TOWARDS THE MILKY WAY AT A SPEED OF ABOUT 250,000 MILES PER HOUR.
7. *SPACE-TIME IS NOT FLAT*: ACCORDING TO EINSTEIN'S THEORY OF GENERAL RELATIVITY, SPACE-TIME IS CURVED BY THE PRESENCE OF MASS AND ENERGY.
8. *GRAVITATIONAL WAVES EXIST*: GRAVITATIONAL WAVES ARE RIPPLES IN THE FABRIC OF SPACE-TIME THAT ARE PRODUCED BY THE ACCELERATION OF MASSIVE OBJECTS.
9. THE UNIVERSE IS ABOUT 13.8 BILLION YEARS OLD: THE AGE OF THE UNIVERSE HAS BEEN ESTIMATED TO BE ABOUT 13.8 BILLION YEARS, BASED ON OBSERVATIONS OF THE COSMIC MICROWAVE BACKGROUND RADIATION.
10. *STARS COME IN DIFFERENT COLORS*: STARS CAN HAVE DIFFERENT COLORS DEPENDING ON THEIR SURFACE TEMPERATURE, WITH HOTTER STARS APPEARING BLUE AND COOLER STARS APPEARING RED.
11. *GALAXIES ARE GROUPED INTO CLUSTERS*: GALAXIES ARE OFTEN GROUPED TOGETHER IN CLUSTERS, WHICH CAN CONTAIN HUNDREDS OR EVEN THOUSANDS OF GALAXIES.
12. *THE MILKY WAY IS A BARRED SPIRAL GALAXY*: THE MILKY WAY GALAXY, WHICH CONTAINS OUR SOLAR SYSTEM, IS A TYPE OF GALAXY KNOWN AS A BARRED SPIRAL.
13. *SPACE IS FILLED WITH MYSTERIOUS SIGNALS*: SCIENTISTS HAVE DETECTED VARIOUS MYSTERIOUS SIGNALS COMING FROM DEEP SPACE, INCLUDING FAST RADIO BURSTS AND GAMMA-RAY BURSTS.
14. *ASTEROIDS CAN HAVE MOONS*: SOME ASTEROIDS HAVE BEEN FOUND TO HAVE THEIR OWN MOONS, WHICH CAN PROVIDE VALUABLE INFORMATION ABOUT THE FORMATION AND EVOLUTION OF THE SOLAR SYSTEM.
15. *COMETS MAY HAVE DELIVERED WATER TO EARTH*: SCIENTISTS BELIEVE THAT COMETS MAY HAVE PLAYED A ROLE IN DELIVERING WATER AND ORGANIC MOLECULES TO EARTH.
16. *THE SUN IS A MAIN-SEQUENCE STAR*: THE SUN IS A TYPE OF STAR KNOWN AS A MAIN-SEQUENCE STAR, WHICH MEANS IT IS IN THE MIDDLE OF ITS LIFE CYCLE AND FUSING HYDROGEN INTO HELIUM IN ITS CORE.
17. *NEUTRON STARS ARE EXTREMELY DENSE*: NEUTRON STARS ARE THE DENSEST OBJECTS IN THE UNIVERSE, WITH A TYPICAL MASS OF ABOUT 1.4 TIMES THAT OF THE SUN COMpressed INTO A SPHERE ONLY ABOUT 10 KILOMETERS IN DIAMETER.
18. *DARK MATTER MAKES UP ABOUT 27% OF THE UNIVERSE*: DARK MATTER IS A TYPE OF MATTER THAT DOES NOT EMIT, ABSORB, OR REFLECT ANY ELECTROMAGNETIC RADIATION, MAKING IT INVISIBLE TO OUR TELESCOPES.
19. *THE UNIVERSE IS MADE UP OF ABOUT 68% DARK ENERGY*: DARK ENERGY IS A TYPE OF ENERGY THAT IS THOUGHT TO BE RESPONSIBLE FOR THE ACCELERATING EXPANSION OF THE UNIVERSE.
20. *SPACE EXPLORATION HAS MANY BENEFITS*: SPACE EXPLORATION HAS LED TO NUMEROUS BREAKTHROUGHS AND ADVANCEMENTS IN TECHNOLOGY, MEDICINE, AND OUR UNDERST
