Estrellas y galaxias: ¿qué son las estrellas?

The video tutorial explains that the Sun is the closest star to Earth, appearing brighter and larger due to its proximity. It describes stars as hot balls of gases, emitting energy through chemical reactions. Astronomers study stars by analyzing the light they emit. The video also covers how distances in space are measured, using kilometers for shorter distances and light-years for those beyond the solar system. Examples include Proxima Centauri, 4.3 light-years away, and Ragel in Orion, 910 light-years away.

Which star is the closest to Earth?

• Alpha Centauri

• Sirius

• The Sun

• Proxima Centauri

Why does the Sun appear larger and brighter than other stars?

• It is closer to Earth

• It is made of different materials

• It emits more light

• It is larger than all other stars

What are stars primarily composed of?

• Solid rock

• Burning gases and plasma

• Liquid water

• Metallic elements

What unit do astronomers use to measure distances to stars outside our solar system?

• Light-years

• Kilometers

• Miles

• Astronomical units

How far is Proxima Centauri from Earth in light-years?

• 1.5 light-years

• 4.3 light-years

• 10 light-years

• 100 light-years