hydrogen- a colourless, highly flammable gas eg. "In order to get rid of hydrogen, some oxygen is added to the helium." tenuous- having little strengthor substence, not think or dense eg. "The cinema has had a tenuous existence in recent years." glimmer- to give off an unsteady reflection, to shine faintly eg. "Candles glimmered in the windows of the inn. exoplanet- a planet orbiting a star different than our sun eg. "The news of another exoplanet discovery is nothing extraordinary." to rust- to contract rust or become rust- colored eg. "A bicycle will rust if you leave it in the rain"
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