Articles on Outer space

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Astronomers can estimate ages for stars outside the Solar System, but not planets. Corbis Historical via Getty Images

How do astronomers know the age of the planets and stars?

Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.
Space exploration is becoming a more feasible reality, prompting a need for international cooperation. (NASA/Unsplash)

Outer space is not the “Wild West”: There are clear rules for peace and war

A new publication clarifies how existing legal frameworks apply to space exploration and development. The McGill Manual also highlights the catastrophic implications of conflict in space.
Pluto, the largest of the dwarf planets. This image was taken by NASA’s New Horizons spacecraft. NASA/JHUAPL/SwRI

What is a dwarf planet?

The dwarf planets in our Solar System are cold, dark, far away and full of surprises.

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