He is widely considered to be one of the greatest American presidents. He led the country through the Civil War, freed the slaves, and preserved the Union. His picture was put on the cent in 1909 ...
During the American Civil War, the President of the Union (i.e., the United States), Abraham Lincoln, had one persistently pursued goal, namely, preservation of the Union. As the war progressed ...
The Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star. Without the Sun’s energy, life as we know it could not exist on our home planet. From our vantage point on Earth, the Sun may appear like an ...
The Sun is the star at the heart of our solar system. Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest bits of debris – in its orbit.
The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids. Beyond our own solar system, there ...
Jupiter is the fifth planet from the Sun, and the largest in the solar system – more than twice as massive as the other planets combined.