Alex Johnson

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Planetary nebula

A <b>planetary nebula</b> is a nebula that is made up of gas and plasma. They are made by certain types of stars when they die. They are named this because …

Black Holes

These mighty voids are what's left of former stars.<p>Black holes are the cold remnants of former stars, so dense that no matter—not even light—is able to escape their powerful gravitational pull.<p>While most stars end up as white dwarfs or neutron stars, black holes are the last evolutionary stage in …

What Is a Black Hole?

BBC - GCSE Bitesize: Formation of a star

Stars form when enough dust and gas clump together because of gravitational forces. Nuclear reactions release energy to keep the star hot. Planets form when smaller amounts of dust and gas clump together because of gravitational forces.<p>Stable stars like the Sun change during their lifetime to form …

Planets

Stars: Development

Star Life And Death<p>Just like living organisms, stars have a life cycle. In the same way that you are born, develop, age and die, stars do the same …

Stars Fun Facts for Kids

Look up in the sky at night and you’ll notice thousands of small lights. Some lights are bright, others are dim. Some look white or blue, while …

Fun Star Facts for Kids

Stars are usually between 1 and 10 billion years old. Some stars may even be close to the age of the observed Universe at nearly 13.8 billion years …

Space for Kids - Our Universe - Star birth

Nearby galaxy NGC 1569 is a 'hotbed' of star birth activity<p>Star birth<p>Like people, stars are born, they grow old and they die. Their birth places are …

Where Is the Center of the Universe?

Where Did the Big Bang Happen?

Big Bang Briefly

The Big Bang: Crash Course Big History #1

Big Bang Theory

The Big Bang theory is an effort to explain what happened at the very beginning of our universe. Discoveries in astronomy and physics have shown …

The Beginning of Everything -- The Big Bang

Stephen Hawking - The Big Bang

The Fate of the Universe: Heat Death, Big Rip or Cosmic Consciousness?

By piecing together an increasing number of clues, cosmologists are getting closer to understanding what the future and ultimate fate of the universe …

Dark Matter

The History & Structure of the Universe (Infographic)

The Illuminated Universe<p>Credit: Illustration: Karl Tate, based on a photo of Galaxy M74 (NASA, ESA, and Hubble Heritage Collaboration) and the …

Big Bang, Deflated? Universe May Have Had No Beginning

If a new theory turns out to be true, the universe may not have started with a bang.<p>In the new formulation, the universe was never a singularity, or …

Physics

4 Multiverses You Might Be Living In

Our universe might be just one of many. The inflationary multiverse theory suggests that "Big Bangs" are creating universes continuously. While the …