Which star has the largest radius?
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun.
Which of the following layers in the sun is the coolest?
While the center of the Sun’s core can get as hot as 30 million degrees F, its outer layers cool down. The photosphere, which is outside the core, is the coolest layer.
Why does a sunspot appear dark brown or black compared to the photosphere?
All in all, the sunspots appear dark because the are darker than the surrounding surface. They’re darker because they are cooler, and they’re cooler because of the intense magnetic fields in them.
Which of these layers of the sun is coolest a core B radiation zone C photosphere?
The inner layers are the Core, Radiative Zone and Convection Zone. The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona. Photosphere – The photosphere is the deepest layer of the Sun that we can observe directly.
Which star has the smallest radius?
The smallest known star right now is OGLE-TR-122b, a red dwarf star that’s part of a binary stellar system. This red dwarf the smallest star to ever have its radius accurately measured; 0.12 solar radii. This works out to be 167,000 km.
How big is the biggest star compared to Earth?
The video “Star Size Comparison” (duration: 2:34) nicely visualizes how tiny Earth (diameter 12756 km) is compared to the Sun (diameter 1,392,000 km, 109.1 times Earth’s). And how tiny the Sun is compared to other stars. Factoid from the video: VY Canis Majoris (a red hypergiant) is the largest known star.
Which layer of the sun is the thickest?
At the very center is the dense, hot core. Around the core lie two layers: a thick layer called the radiative zone and a thinner, cooler layer called the convective zone. Surrounding all of them is the sun’s surface layer, known as the photosphere.
Which of the following parts of the sun is the hottest?
And the hottest part of the Sun is its core. The surface of the Sun is a mere 5,800 Kelvin, while the center of the Sun is around 15 million Kelvin. That’s hot. Although the surface of the Sun is relatively cool, the corona can get much hotter.
How many Earths can fit in the sun?
The Sun is 864,400 miles (1,391,000 kilometers) across. This is about 109 times the diameter of Earth. The Sun weighs about 333,000 times as much as Earth. It is so large that about 1,300,000 planet Earths can fit inside of it.
How long can sunspots last?
The duration of the sunspot cycle is, on average, around eleven years. However, the length of the cycle does vary. Between 1700 and the present, the sunspot cycle (from one solar min to the next solar min) has varied in length from as short as nine years to as long as fourteen years.
What causes sunspot?
Sunspots are caused by the Sun’s magnetic field welling up to the photosphere, the Sun’s visible “surface”. The powerful magnetic fields around sunspots produce active regions on the Sun, which often lead to solar flares and Coronal Mass Ejections (CMEs). Our Sun isn’t the only star with spots.
Are sunspots hotter or cooler?
Sunspots are darker, cooler areas on the surface of the sun in a region called the photosphere. The photosphere has a temperature of 5,800 degrees Kelvin. Sunspots have temperatures of about 3,800 degrees K. They look dark only in comparison with the brighter and hotter regions of the photosphere around them.
How much hotter is the core of the sun than its surface?
How much hotter is the core of the sun than its surface? The solar core from where the Sun’s energy is made is very much hotter than the surface of the Sun. The surface of the Sun has the temperature over 5500 degrees Celsius (10,000 degrees Fahrenheit) .
Which layer of the sun do we normally see?
The photosphere is the lowest layer of the solar atmosphere. It is essentially the solar “surface” that we see when we look at the Sun in “white” (i.e. regular, or visible) light. When we observe sunspots and faculae (bright little cloud-like features) we are observing them in the photosphere.
What does the corona do?
A corona (Latin, ‘crown’) is an aura of plasma that surrounds the Sun and other stars. The Sun’s corona extends millions of kilometres into outer space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.
Photo in the article by “Penmon”