Glossary of Scientific Terms

Half-life

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(Isotope)

Isotope

Helios

The sun seen in Hydrogen-alpha light.

In Greek mythology, Helios was god of the sun. Helios drove his chariot across the sky each day to provide daylight and returned home each night on the river Oceanus in an enormous golden cup to hide the light.

Solar Data

Rotational PeriodRadiusMassLuminosity
25.4 days695,700 km1.99*1030 kg3.90*1026 Watts