Mercury reaches its point of greatest eastern elongation on Friday (July 4), presenting an excellent opportunity to spot the ...

Astronomers using the European Space Agency's Cheops mission have caught an exoplanet that seems to be triggering flares of ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

Stars often whip their planets with solar winds and radiation, pull them ever closer with gravity and sear them with heat.

At the aphelion, the distance from the Earth’s center to the Sun’s center is going to be 152,087,738 kilometers (94,502,939 ...

How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds ...

A stronomers have discovered over 100 new alien worlds so far this year — some many light-years away from Earth — that ...

Our planet whirls around the sun in an ellipse, rather than a circle. ... Mars, with an eccentricity of 0.094, ranges from 129 to 155 million miles away from the sun.

According to the National Weather Service, the summer solstice will occur on Friday at 10:42 p.m. Eastern time (it will be ...