What is the biggest star we know? - NASA
Question: What is the biggest star we know? Answer: The largest known star (in terms of mass and brightness) is called the Pistol Star. It is believed to be 100 times as massive as our Sun, and …
StarChild: The Universe - NASA
The universe is a huge wide-open space that holds everything from the smallest particle to the biggest galaxy. No one knows just how big the Universe is. Astronomers try to measure it all the time. They …
When did the first stars form in the universe? - NASA
Results from NASA's Wilkinson Microwave Anisotropy Probe (WMAP) released in February 2003 show that the first stars formed when the universe was only about 200 million years old. Observations by …
StarChild: Cosmology - NASA
He thought Earth was the center of the universe and that the Sun, Moon, planets, and all the fixed stars revolved around it. Aristotle's ideas were widely accepted by the Greeks of his time. The exception, a …
StarChild: Cosmology - NASA
About 100 years ago, astronomer Edwin Hubble made observations that showed the universe was getting bigger and bigger! This led most cosmologists to believe in a theory called the Big Bang. The …
StarChild: Stars - NASA
Stars Stars change over time. It may take millions to billions of years for a star to live out its life. That is a very, very long time! A star is a big ball of gas which gives off both heat and light. So where do stars …
How old is the universe? - NASA
Jul 21, 2023 · We do not know the exact age of the universe, but we believe that it is around 13 billion years - give or take a few billion. Astronomers estimate the age of the universe in two ways: (a) by …
StarChild: The Solar System - NASA
The Sun is the biggest object in our solar system. It contains more than 99% of the solar system's mass. Astronomers think the solar system is more than 4 billion years old. Astronomers are now finding …
StarChild: Space Probes - NASA
Space probes are made to conduct science experiments. They do not have people on them. Space probes have helped scientists get information about our solar system. Most probes are not designed …
Olympus Mons - NASA
Olympus Mons is the tallest mountain in the solar system. Its peak is over 26 kilometers above its base. Olympus Mons is called a shield volcano because of its shape. The volcano is very tall, but it has a …