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What’s the atmosphere? Weather science

By | 2017-08-19T09:55:46+00:00 August 19th, 2017|Physics|

Did the Earth look like this right after it cooled down? The atmosphere is the air that is wrapped all around a planet. Not all planets have atmospheres. In order to have an atmosphere, the planet has to have enough gravity to hold on to light atoms like hydrogen and helium. It has to keep those atoms from floating away into [...]

Venus – Planets – Astronomy – Space science

By | 2017-08-19T09:36:13+00:00 August 19th, 2017|Physics|

This is what the planet Venus looks like from space. Venus is the second planet away from our Sun - Mercury is closer to the Sun, and then the Earth is a little farther from the Sun. Like the Earth, Venus probably formed about four and a half billion years ago, out of space dust in the same nebula. Venus is [...]

Uranus – Planets – Astronomy – Space science

By | 2017-08-19T09:32:58+00:00 August 19th, 2017|Physics|

Uranus, the second to last planet out from the Sun Uranus is between Saturn and Neptune, so it's the next to the last planet away from our Sun. It takes Uranus 84 years to go around the Sun because it is so far away. Like the other planets going around our Sun, Uranus (YER-ann-uss) formed about 4.5 billion years [...]

Supernova – Space – Astronomy

By | 2017-08-19T09:23:22+00:00 August 19th, 2017|Physics|

Supernova from space (thanks to NASA and the Hubble Telescope) Supernovas are exploding stars. Red giant stars explode when they have used up their hydrogen and helium fuel, and converted most of their atoms to iron atoms. Red giant stars have a lot of gravity pulling them inward. Normally they don't collapse inward because the nuclear fusion going on inside them pushes energy outward. That [...]

What’s the sun made of? – Astronomy – Science

By | 2017-08-19T02:18:29+00:00 August 19th, 2017|Physics|

The sun from space The Sun is a star, just like billions of other stars in the universe. Our Sun probably formed a little more than four and a half billion years ago, just a little bit before the planets formed around it. It's not one of the older stars in the Universe. Probably some of [...]

What are stars made of? Astronomy, physics

By | 2017-10-14T16:41:05+00:00 August 19th, 2017|Physics|

The sun from space The earliest stars probably formed only a few hundred thousand years after the Big Bang that started the universe - maybe about 13.5 billion years ago. Stars are the oldest big objects in the Universe. Stars formed big clumps of hydrogen and a few helium atoms, the simplest kinds of atoms, and [...]

Saturn – Planets – Astronomy

By | 2017-08-19T01:37:41+00:00 August 19th, 2017|Physics|

Saturn, as seen from space After Jupiter, Saturn is the next farthest planet out from our Sun. In some ways, Saturn is a lot like Jupiter - it's very cold, and it's mostly made of an ocean of hydrogen molecules, with some helium and a little bit of other things. Like Jupiter and the other planets around our Sun, Saturn [...]

What are planets? Astronomy – Space science

By | 2017-08-19T01:34:27+00:00 August 19th, 2017|Physics|

The planet Venus from space For several hundred million years after the Big Bang, there were no planets, only stars. Planets couldn't form until the first stars ran out of fuel and exploded into supernovas, about 14 billion years ago. The supernovas spewed out thousands of tons of carbon, oxygen, iron and other elements into space. Planets are made out of the recycled atoms [...]

Neptune – Planets – Astronomy – Physics

By | 2017-08-19T01:25:54+00:00 August 19th, 2017|Physics|

Neptune from space Neptune is the farthest planet from our Sun. Neptune is the only planet that is so far away that you can't see it without a telescope. Neptune (NEPP-toon) is an icy planet, about the same size as Uranus. Neptune's probably a lot like Uranus in other ways, too. Neptune has a rocky core [...]