Stars | stars information | science facts | the universe | Earth Science

 STARS | STARS INFORMATION | FACTS ABOUT UNIVERSE
SCIENCE FACTS

Stars are cosmic energy engines that produce heat, light, ultraviolet rays, x-rays, and other forms of radiation. They are composed largely of gas and plasma, a superheated state of matter composed of subatomic particles.
Though the most familiar star, our own sun, stands alone, about three of every four stars exist as part of a binary system containing two mutually orbiting stars.
No one knows how many stars exist, but the number would be staggering. Our universe likely contains more than 100 billion galaxies, and each of those galaxies may have more than 100 billion stars.
Yet on a clear, dark night Earth's sky reveals only about 3,000 stars to the naked eye. Humans of many cultures have charted the heavens by these stars.

What Are Some Interesting Facts About Earth? | Some facts about Earth

What Are Some Interesting Facts About Earth?


Most people enjoy sports or movie trivia, but how about trivia about the planet we live on. The fascination of celestial bodies often starts by looking at information about our own planet and then comparing it to others.

Earth Facts

• Age: Scientists estimate the Earth to be around 4.6 billion years old.
• Day: A day is how long it takes the Earth to make one revolution. It takes the Earth 23 hours, 56 minutes and 4 seconds to make this journey.
• Year: A year is how long it takes the Earth to go around the sun once. This takes 365 days, 5 hours, 41 minutes and 48 seconds. The extra time is why we add a day to the calendar every four years. This is called leap year.
• Circumference: The circumference of the earth at the equator is approximately 29,401.55 miles. However, since the Earth is not completely round, but rather bulges in the center, measuring the Earth’s circumference around the north and south poles gives a slightly smaller circumference of 24,859.82 miles.

Survival in Space Unprotected Is Possible--Briefly | Science facts | strange but true

 Survival in Space Unprotected Is Possible--Briefly 
science facts


As far as certain death in a science fiction plot line goes, being ejected into the vacuum of space is more than a pretty sure thing. A shove out of the air lock by a mutinous lieutenant or a vicious rip in a space suit, and your average movie victim is guaranteed to die quickly and quietly, though with fewer exploding body parts than screenwriters might have you believe.