# How big are stars compared to planets?

## How big are stars compared to planets?

Its average diameter is ā 12 742 km and that of the Sun, ā 1,392,684 km (ā 109 times larger). The image shows the size ratio Earth / Sun, if the Earth stood on the same plane, very close to the Sun….Size of Earth relative to Sun.

Mean radius (km) Number of planets in one solar volume
Sun 696 342 1

### Why are stars different sizes?

But for all other stars, their sizes are determined by that simple balance: the force from the outward radiation, at the surface, has to equal the inward pull of gravitation. Larger radiation forces means the star swells to larger sizes, with the largest stars of all swelling to billions of kilometers.

#### How are planets different sizes?

Planets come in different sizes and so have different gravity levels. Mars is smaller than Earth so has less gravity. On Mars you weigh less and would be able to carry more. Smaller planets are also less likely to have an atmosphere, as there may not be enough gravity to hold the gases to the surface.

Why are all stars not the same size?

Can stars be different sizes?

Stars come in huge range of different sizes. Neutron stars can be just 20 to 40 km in diameter, whereas white dwarf can be very similar in size to Earth’s. The largest supergiants, on the other hand, can be more than 1500 times larger than our Sun.

## Is planets smaller than a stars?

A planet is a nearly spherical body which is in orbit around the Sun. Our Sun is a star which is many times bigger than all of the planets. A solar system is a star and all of its planets, asteroids, comets and other bodies. It is significantly bigger than a star.

### Can planets be bigger than their star?

If the fraction of them that has a gas giant orbiting them is small, that could still mean a lot of such systems exist in total. So there you go. A rare actual answer in astronomy: Yes, a planet can be bigger than its star!

#### What is the closest body to the earth in space?

The moon is the celestial body closest to earth.

How do stars compare to planets?

Planets are typically brighter than stars. The reason for differing brightness is because starts reflect the light of the sun, which is close to the planets, while the stars emit their own light. Regarding shape, stars appear as a dot while planets appear spherical. Generally, stars are also bigger than planets.

Is a star the same as a planet?

The basic difference between a star and a planet is that a star emits light produced by a nuclear reaction in its core, whereas a planet only shines by reflected light. Not all objects in the universe that don’t produce their own light are planets however.

## What is the relative size of a star?

Stars come in huge range of different sizes. Neutron stars can be just 20 to 40 km in diameter, whereas white dwarf can be very similar in size to Earth’s. The largest supergiants, on the other hand, can be more than 1500 times larger than our Sun.