The solar system has eight planets, categorized as inner rocky planets Mercury (Budh), Venus (Shukra), Earth (Prithvi), Mars (Mangal) and outer gas or ice giants Jupiter (Brihaspati), Saturn (Shani), Uranus (Arun), Neptune (Varun). The closest planet to Earth is Venus (Shukra). The farthest planet from Earth is Neptune (Varun). On Earth, 1 year is approximately 365 days, and a week has 7 days. A day on Earth consists of 24 hours, 1 hour has 60 minutes, 1 minute has 60 seconds, and 1 second has 1000 milliseconds.