Ailsa Harvey

Reference We GPS all the time but how does it work and why was it invented? Here we explore this vital space-based technology.

Reference Artemis is NASA's plan to go back to the moon.

Reference Learn how stars form, how stars and constellations are named, what happens when stars like our sun evolve, and ultimately, die.

Reference Heliocentrism places the sun at the center of the Solar System. This is the history of how scientists discovered our place and in the Solar System.

Reference The V2 rocket was the world's first liquid-propellant rocket. After claiming thousands of lives, how did it become a revolutionary breakthrough in rocket technology?

Reference Cosmology by definition is the branch of astronomy involving the origin and evolution of the universe, from the Big Bang to the future of the cosmos.

Reference This list of famous astronomers includes great scientists in history who mastered many fields and modern astronomers who helped popularize astronomy.

Reference This gas giant is the largest planet in the solar system, but just how big is Jupiter?

Reference Exactly how many stars are in the universe is impossible to know because we aren't sure of its scale.

Reference Geoengineering is the use of technology to alter Earth's climate. This can take place on Earth or in space.

REFERENCE Kalpana Chawla's story has inspired millions to pursue careers in space.

Reference Astronomers say there are 100 billion to 200 billion galaxies in the universe. But accurately counting the number of galaxies depends on several factors.

Reference Albert Einstein profoundly changed physics and ideas about space and time. Learn more about his life, theories and scientific impact.

Reference Sirius has been the shiniest star in the sky for a long, long time.

Reference What is the sun made of? In several layers, hot gases are converted into energy and released as heat and light.

Reference Earth's star is the largest and the most massive object in the solar system. More than one million Earths could fit inside the sun.

Reference Scientists have found nearly 5,000 exoplanets since the first such world was confirmed orbiting a sunlike star in 1995. These ones are most similar to Earth.