English ComprehensionMediumThe planets glow from heat left over from their formation about how long ago?A4.5 billion yearsB60 million yearsC128 yearsD1000 yearsCheck AnswerAnswerThe correct answer is Option B.Share:WhatsAppTwitter🔗 Copy LinkDetailed SolutionAbout 60 million years.conceptual solutionAbout 60 million years.Browse All PYQ PapersTake a Mock Test