And then there are eight…

From BBC news
What makes a planet?

Long time back, if you can detect it on a telescope, it’s fine.

This was how Pluto became our solar system’s ninth planet after Clyde Tombaugh discovered it.

Now with much more powerful viewing devices, it’s become more important to define what exactly a planet is. Otherwise far off objects bigger than Pluto will have to be added to the original list of nine planets orbiting the Sun.

Astronomers have decided on the following criteria, a planet must:

– be in orbit around the Sun
– be large enough that it takes on a nearly round shape
– has cleared its orbit of other objects

In a historic and very likely highly emotional meeting, the International Astronomical Union (IAU) reclassifed Pluto as a dwarf planet. A brave rational move. Pluto is now classified as a dwarf planet.

So now there are eight. Well its an auspicious number.

Advertisements

2 thoughts on “And then there are eight…”

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s