The Sun is the star at the centre of our solar system ... As we all know, sometimes it’s day… and sometimes it’s night… but why do we have day & night? My guest today is here to tell ...

With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system ... rotates on its axis every 23.9 hours, defining day and night for surface dwellers. This axis of rotation ...

Between February 25 and February 28, all seven planets in our solar system will be visible in the night sky. It's known as a planetary parade. You'll need a telescope for some of them, but you ...

"These objects really could be anywhere in the solar system at any given time." One million alien visitors from another star system could already be lurking in the solar system. We aren't talking ...

Solar energy doesn't work at night without a storage device such as a battery, and cloudy weather can make the technology unreliable during the day. Solar technologies are also very expensive and ...