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Olivia Johnson

Recent articles by Olivia Johnson

Equinoxes occur when the Sun crosses the celestial equator. For Earth, this is the point that the planet’s axis points neither towards nor away from the Sun. Credit: BBC Sky at Night Magazine
Science

Autumn equinox 2021: when it is and what it means

The region at the centre of the Milky Way, captured in X-ray by the Chandra X-ray Observatory and radio by the MeerKAT telescope. (Credit: X-Ray: NASA/CXC/UMass/D. Wang et al.; Radio: SARAO/MeerKAT)
Science

What is the electromagnetic spectrum?

How big is our Solar System? credit: MARK GARLICK/SCIENCE PHOTO LIBRARY
Science

How big is the Solar System?

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