Astronomy Staff, Author at Astronomy.com | Page 2 of 278

Eyepiece showing field stop

Telescopes and Equipment

What is the difference between a 2″ eyepiece and a 1¼” eyepiece?

DSCOVR image of Earth and Moon

Science, Solar System

How much less would you weigh on the Moon than on Earth?

Telescopes and Equipment, Upcoming Events

The NEAF Expo is back again for its 34th year

Lagrangian points of the Earth-Sun system

What are Lagrangian points?

Telescopes and Equipment

Lucky new astronomy product finds this month

Saturn ring shadows

Do Saturn’s rings cast shadows?

Gear Guide, Telescopes and Equipment

Fall in love with new astronomy products this month

Artist's concept of what Andromeda will look like in the sky in the future

Milky Way, Solar System

What will happen to the solar system when the Milky Way and Andromeda Galaxy merge?

Solar system planets

Why do the solar system’s planets have different compositions?

Artist's concept of the interior of a white dwarf

Solar System, Stars

After our Sun becomes a white dwarf and cools completely, what will be left?

Cozy up with new astronomy products this month

Comet 67P/Churyumov-Gerasimenko

Does a comet’s period change because it loses mass every time it nears the Sun?