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Science: The planet that should have died

26 July 1991

Science: Ice dwarfs at the edge of the Solar System

12 July 1991

Forum: A plague of planets - Ken Croswell wishes astronomers would stop crying wolf

24 May 1991

Dust in space

17 May 1991

Forum: What's so special about the centre? - It is time for a little post-Copernican thinking

16 February 1991

The Galactic empire

1 December 1990

Our Milky Way is more than just a huge spiral galaxy, it is also the centre of a vast empire that spans more than a million light-years and governs at least 10 other galaxies

The death throes of a red giant: Astronomers have known for years that old stars swell up to become red giants. Now they are beginning to understand how these stars cook up many important elements, such as carbon

24 March 1990

Rocky dwarfs and gassy giants

10 February 1990

Origin of the chemical elements

3 February 1990

Good vibrations from the stars: Our planet rings like a bell after a large earthquake. Stars can ring, too. Astronomers use these vibrations to probe stellar interiors and even estimate the age of the Universe

27 January 1990