By: Carli Cosenza 1st Hour

Regulus:

Basic Information:-Regulus is also known as Alpha

Leonis. -Not counting the Sun, it is the 21st

brightest star in the sky, as seen from it’s apparent brightness from Earth.

-Regulus is a multiple star system- it is orbited by a distant binary pair of stars.

Regulus’ Size:REGULUS: THE SUN:

The Diameter may be over 3.14 times that of the Sun.

This would make the diameter around 2,715,905 miles!

1,391,980 kilometers, or 864,938 miles, in diameter.

As you can see, Regulus is a lot bigger!

Temperature: REGULUS THE SUN

The temperature at its poles is 15,00 degrees Celsius, whereas at the equator, the temperature is 10,000 degrees Celsius.

This temperature is a lot hotter than the Sun, which is one of the reasons why it is the 21st brightest star in the sky.

10,000 degrees Fahrenheit, or 6,000 degrees Celsius.

Color: REGULUS SUN:

Regulus is a blue-white-colored star.

The Sun is yellowish-orange colored.

Regulus is very different than the Sun.

The Sun doesn’t look like Regulus at all.

Distance from the Sun Regulus is 77 light years away from

the Sun, making it the closest star to the Sun.

Although it sounds really far away, this is a remarkably close distance in space!

Regulus in an HR Diagram.

Regulus

Leo: Regulus is located in the constellation Leo. As its story

goes, Heracles, a Greek hero, wanted to fight off Nemean Lion, a huge and dangerous beast. The beast, however, fought and killed Heracles, gaining power.

This constellation is shaped like Nemean Lion. Regulus is the heart of the Lion in this constellation. In

ancient cultures, Regulus, the brightest star in Leo, has been associated with the concept of royalty and kingly power.

It has been said that Regulus focuses the energy of Sirius, the brightest star in the sky, towards the Earth. Regulus acts as a “regulator” for the energies of Sirius.

Picture of Regulus in Leo.

Life Cycle of Regulus: Regulus was born because of a nebula, or a giant cloud of

gas and dust. It will live its life as a blue supergiant, or even a blue-white

supergiant, because of its hot temperature and giant mass.

Near the end, it will cool down to a Red Supergiant. Regulus will then die in either a giant explosion, called a

supernova, or a black hole, which means that it becomes so dense that that nothing can escape its gravitational pull, and it turns completely black.

Currently, Regulus is 150 million years old, which is pretty old for such a big mass, probably near the middle-end part of its life, and Regulus is still a blue-white supergiant.

Sources: http://www.solstation.com/stars2/regulus3.htm http://www.daviddarling.info/encyclopedia/R/Regulus.html http://www.innovations-report.com/html/reports/physics_astr

onomy/report-39041.html http://en.wikipedia.org/wiki/Regulus http://www.universetoday.com/2005/01/21/egg-shaped-regul

us-is-spinning-fast/ http://www.slackerastronomy.org/wordpress/2008/06/regulus

-just-when-you-think-you-know-a-star/

The End!Hope you enjoyed the

PowerPoint and learned a lot!