gravity articles

What force is causing the nebula to get denser and hotter?

Vast, diffuse clouds of interstellar gas and dust, known as nebulae, are the stellar nurseries of the cosmos, yet they a...

What force causes the nebula to contract?

The vast, luminous clouds scattered across the cosmos, known as nebulae, represent the stellar nurseries of the universe...

What makes satellites orbit the Earth?

The simple visual of a machine circling our world often conjures the question of how it manages to hang suspended in the...

What slows the contraction of a star-forming cloud?

The process by which a vast, cold, tenuous cloud of gas and dust gives birth to a star is fundamentally a contest: the r...

Why don't stars fall out of the sky?

The notion that stars might suddenly detach from the heavens and drop toward Earth is a dramatic image, but it rests on ...

How does a protostar generate energy?

The creation of a star is not an instantaneous event but a drawn-out, tumultuous adolescence where gravity wrestles with...

What slows the contraction due to gravity of an interstellar cloud?

The inexorable pull of gravity initiates the grand cosmic process of star formation, drawing vast, cold expanses of inte...