Which is bigger betelgeuse or rigel

Betelgeuse is is at least times the Sun's diameter, and perhaps much more. It puts out about , times more energy than the Sun does. And when it dies, it will create a fireball that will briefly outshine billions of normal stars. Betelgeuse is a red supergiant — the largest class of stars. The gravity of such a star squeezes its core tightly, heating it to billions of degrees.

It then fuses the helium to make heavier elements — carbon and oxygen at first, and eventually all the way up to iron. When that happens, the star no longer produces energy in the core. Without the reactions in its core to push outward, gravity quickly causes the core to collapse, forming a neutron star. Rigel is a blue supergiant. Like Betelgeuse, it is much bigger and heavier than the Sun.

It's surface is thousands of degrees hotter, however, so it shines blue-white. That high temperature means that Rigel also pumps out a lot of ultraviolet energy, which produces sunburn and other problems.

There was much speculation that this anomalous dimming was a sign that the star might be preparing to end its life as a supernova. It has since faded somewhat again, though nothing to compare to the drastic fade down of a year ago. On Aug. The gas and dust that was blown away after the "big sneeze" eventually condensed into a dark cloud. That cloud blocked a part of the star's face as seen from the perspective of Earth and thus caused the star to appear to dim. Some residual gas and dust may have since condensed into a smaller cloud which may be resulting in another round of apparent dimming of Betelgeuse at the present time.

Stars produce their energy by fusing hydrogen into helium deep within their cores. When a star accumulates sufficient helium in its core, its energy output increases significantly, and it swells into a red giant or supergiant, like Betelgeuse. This is what Rigel will become in a few million years. In such stars, the core produces successively heavier elements to balance the incessant crush of gravity.

But once the core begins creating iron, a star's days are numbered; the formation of elements heavier than iron consumes rather than produces energy. Eventually, since the core can no longer support the star's vast weight it collapses, triggering a cataclysmic supernova explosion.

Betelgeuse is in its final stage and could explode within the next , years. He writes about astronomy for Natural History magazine, the Farmers' Almanac and other publications. Neptune is in the outer solar system, 4. Neptune is four times larger than the earth.

Our Sun is very small, compared to some stars. The planets are as dust compared to blue and red Giant of our universe. The video shows first, our Moon, the planets of our arranged in order of increasing size solar system and the Sun.

Then go scrolled, the biggest stars of our galaxy. Their approximate sizes were calculated from their brightness, their temperatures, they even deducted from their colors, and their distances. Distance from the Sun varies throughout the year between ,, km and ,, km, it is a function of the eccentricity of Earth's orbit and hence its apparent size as seen from Earth also varies.

The distance of the Moon varies during the month between , and , km, it is a function of the eccentricity of the lunar orbit and hence its apparent size as seen from Earth also varies. When the Moon is at its apogee, that is farthest from the Earth, its apparent diameter is smaller than that of the sun at this point of its orbit is too small to completely cover the solar disk.

When the Moon is at perigee, i. Two or three times a year, Solar Dynamics Observatory of NASA observed the moon passing in front of the sun, as the right image taken on October 7, Earth is small compared to the Sun , in the volume of the Sun could put more than a million Earths 1,, Since April the mission of the Space Telescope SDO is to examine the sun's magnetic field, it allows a better understanding of the solar atmosphere and the role Sun plays on climate and atmospheric chemistry of the Earth.

The telescope has 10 CCDs high quality in visible light which are also designed for the detection of light in the extreme ultraviolet. This orbit has a semi-major axis of about 42 km. If the orbit is in the plane of the equator, the satellite appears as a fixed point in the sky. It is then called "geostationary orbit".

The geostationary orbit is a geosynchronous orbit which has an inclination and a zero eccentricity. If the orbit is inclined to the plane of the equator, the satellite discloses an analemma in the sky when viewed from a fixed point on the surface of the Earth. The inert and the living. Living cell. Liquid water. Are we alone? Deep sea life. Explosion of life. Global warming. Dwarf planets. Close stars. Brightest stars.

Group of stars.