What stage is Vega the star in?

Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a planetary nebula is formed.

Massive stars tend to go out with an explosion called a supernova. Learn about how the iron cores of stars cause the explosions, the contraction of the core, and how the core bounces and results in explosions.

Neutron stars have life cycles that include being born after a supernova explosion and experiencing extreme pressure that causes protons and electrons to combine into neutrons. Explore neutron star formation and density, white dwarfs, back holes, and pulsars.

Learn about black holes, their myths and their reality. Learn how black holes form after stars undergo supernovae and create singularities. Discover how big black holes grow, how scientists find black holes and where black holes are located in the universe.

Supergiants are gigantic stars which are at least eight times bigger than our sun. Learn about the life cycle of a supergiant star, from its birth as a solar nebula until its explosive death as a supernova.

A main sequence star has characteristics that place it on an H-R diagram's band, or main sequence. Discover features of a main sequence star and why people may have to leave Earth one day.

Supernovae are explosions that occur due to stellar activity. Learn about the silent explosion of the supernova, explore the different types such as the Type II Supernovae, the Type Ia Supernovae, and the Type Ib Supernovae, and discover memory aids for remembering the different types.

Read the definition of a protostar and discover facts about protostars. Learn how a protostar is formed and understand how a protostar becomes a main-sequence star.

Learn the definition of main sequence stars. Understand the characteristics of main sequence stars and learn about when a star leaves the main sequence.

The cosmic distance 'ladder' refers to the collection of celestial entities connected by intricate links of measurement that provide a scale of astrological distance for scientists. Explore the use of radar, parallax, and star brightness on the 'ladder', and how secondary & tertiary distance indicators are used as well.

Learn about the meaning of planetary nebulae, as well as their forms and structure, lifespan, chemical composition, location, sizes, and shapes, and some facts.

Know the definition of a supergiant star. Become familiar with some famous names of supergiants and their unique characteristics when compared to giant stars and our sun.

Learn about the life cycle of stars and what transpires over the billions of years they exist. Discover how they form in nebulae, and explore the three following stages known as the main sequence stage, the giant stage, and the cooling or explosive stage.

There are many different types of stars in the universe, including main sequence, dwarf, and giant stars . Learn about these different types and more, as well as the star life cycle, from formation until the end of their life.

Urban land development and suburban sprawl can affect the environment in devastating ways. Explore the impacts of urban development and suburban sprawl, then discover their environmental consequences, such as pollution, the loss of biodiversity, and a reduction of natural resources.

There are various methods for determining the temperature of a star, despite the distance from us. Learn about the concepts of a spectrum and electromagnetic radiation, and use wavelength to find the temperature of a faraway star.