Biosphere 2
H.G. Wells created the alien invasion genre
The faint star Trappist-1 and three of its planets
Artist's concept of Kepler Space Telescope

StarDate Radio: September 26 — Moon and Regulus

The Moon cozies up to a “dwarf” in the wee hours of tomorrow morning: Regulus, the brightest star of Leo,...More »

StarDate Radio: September 25 — Biosphere 2

One of the oddest experiments of the 20th century began 25 years ago tomorrow. Eight volunteers sealed themselves inside Biosphere...More »

Stargazing: September 25

Tiny Triangulum, the triangle, wedges between the prominent constellations Andromeda and Aries. Its three brightest stars form an isosceles triangle,...More »

StarDate Radio: September 24 — Autumn Star

The best sign in the night sky that fall has arrived is the appearance of the “autumn star.” It’s the...More »

Stargazing: September 24

The best sign in the night sky that fall has arrived is the appearance of the “autumn star.” It’s the...More »

StarDate Radio: September 23 — Heating Up

When it comes to the greenhouse effect, timing is everything. The current warming of our planet is forecast to have...More »

Stargazing: September 23

The Moon reaches last quarter today. Half of the side that faces Earth is bathed in sunlight, while the other...More »

StarDate Radio: September 22 — Autumn Skies

The Sun changes hemispheres today. It crosses the equator from north to south. That ushers in autumn here in the...More »

Stargazing: September 22

The Sun changes hemispheres today. It crosses the equator from north to south, a moment known as the equinox. That...More »

StarDate Radio: September 21 — H.G. Wells

We all know what happens when aliens invade Earth. They kill as many people as possible, enslave the rest, and...More »

Stargazing: September 21

The reddest star in northern skies stands high overhead during the evening hours. Its official designation is Mu Cephei, but...More »

StarDate Radio: September 20 — Moon and Aldebaran

For most of its long lifetime, a star like the Sun is pretty stable. It steadily “fuses” the hydrogen in...More »

Stargazing: September 20

Aldebaran, the bright orange eye of Taurus, the bull, rises to the lower left of the Moon before midnight, and...More »

Current Magazine

cover of September-October issue

In this issue, get the latest on the search for a large, unseen planet some astronomers think is lurking in the Kuiper Belt, and meet pioneering 19th-century British astronomer Elizabeth Brown, who traveled to Russia to study a solar eclipse.

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