Not only is Earth’s inner core spinning and growing, but it’s also changing shape, according to new research. Our planet’s [… ...

Scientists found that the inner core’s structure changes as it rotates. It deforms at its border, potentially accumulating ...

For the first time, in 1925 and 1926, I made observations at Mount Wilson of such extent and completeness that they were sufficient for the determination of the absolute motion of the earth.

New calculations suggest there's a 2 per cent chance the space rock 2024 YR4 will smack Earth in 2032. The odds of a strike will almost certainly continue to go up and down as the asteroid’s path ...

Research emphasis areas include astrodynamics, which involves orbital and attitude motion of Earth satellites, interplanetary spacecraft, and planetary bodies; global navigation satellite systems ...