space

/Tag: space

What is a nebula? Space and astronomy

By |2018-05-31T11:49:30-07:00August 19th, 2017|Physics|

The Eagle Nebula A nebula is a bunch of atoms and molecules floating in outer space, like a cloud of dust. More than one nebula are called nebulae, because -ae is the plural ending in Latin, just as -s is the plural ending in English. Nebula is the Latin word for a cloud. The earliest nebulae formed just [...]

The Moon – Astronomy – Physics

By |2018-05-31T11:49:27-07:00August 19th, 2017|Physics|

Earth's moon (about 239,000 miles from Earth) (That's almost ten times as far as going all the way around the Earth) Nobody knows exactly how the moon formed, but this is one possibility. After the planet Earth formed (along with the other planets), about four and a half billion years ago, during the Hadean Eon, there were [...]

Meteors – Shooting stars – Astronomy

By |2018-05-31T11:49:25-07:00August 18th, 2017|History|

Lyrid meteor shower Meteors or meteorites are bits of rock (like granite) and ice - usually a mixture of rock and iron and nickel but sometimes just rock or just iron - from out in space that get sucked into the gravity of the Earth and fall through our atmosphere to the ground. Usually this is because a comet has passed close enough to the Earth for [...]

Mercury – Planets – Astronomy

By |2018-05-31T11:49:17-07:00August 18th, 2017|Physics|

Mercury from space Mercury is the closest planet to our Sun. At some parts of its orbit, Mercury is only about 46 million kilometers away from the sun. Because Mercury is so close to the sun, it is very hot there. It is so hot that all the carbon dioxide and oxygen has boiled away, and Mercury has very little [...]

Main sequence stars – Astronomy

By |2018-05-31T11:49:32-07:00August 18th, 2017|Physics|

Main sequence stars: A starry sky with the Milky Way galaxy (thanks to Bernd Nies) What is a main sequence star? Nine out of ten stars that you see in the sky are main-sequence stars, and our sun is one of them. (More about the sun) Most main-sequence stars probably started out as brown dwarfs, and then succeeded [...]

Jupiter – Planets – Astronomy

By |2018-05-31T11:49:17-07:00August 18th, 2017|Physics|

Jupiter from space Jupiter (named after the Roman god Jupiter) is the next planet further out from our Sun after Mars. But Jupiter is much, much further away from the Sun than Mars is. If the Sun were the size of a penny, then Earth would be about six feet away from the Sun. And Mars would be about ten [...]

What is a galaxy? – Astronomy – Space science

By |2019-06-29T09:19:08-07:00August 18th, 2017|Physics|

The galaxy M 100, seen through the Hubble telescope What is a galaxy? A galaxy is a group of millions of stars that are relatively near each other. Most stars seem to be in one or another galaxy. Earth's own star, the Sun, is in the Milky Way galaxy. What is the sun made of? What are [...]