Mass and energy are interchangeable.
Posts by Elizabeth Howell
Pioneer 11 was the first spacecraft ever to encounter Saturn. It paved the way for the even-more-sophisticated Voyager spacecraft.
When the NASA spacecraft Voyager 2 skimmed by Neptune, it acquired images of a faint, continuous ring system encircling the planet.
Voyager 2 realized the vision of what was originally called a Grand Tour of the outer solar system. It remains the only craft to have visited all four outer planets.
American astronomer Asaph Hall discovered Phobos, one of the two Martian moons, on this date in 1877. Did he imagine how well we’d see Mars’ moons today?
On August 7, 1779, Carl Ritter, considered one of the first modern geographers, was born.
The first U.S. patent was for a new method of making potash, an early industrial chemical, used to make soap and other products.
The ocean is saltier in some places than others. But the percentages of various salts in seawater is a constant.
On July 17, 1975, Soviets and Americans accomplished the first handshake between nations in space, in the Apollo-Soyuz Test Project.
Telstar was the first satellite able to relay television signals between Europe and North America. It launched on this date … and helped change the world.