Sun activity: Parker Solar Probe’s record-breaking flyby
Sun activity for September 29 is low, as the Parker Solar Probe completes its closest approach to the sun to date.
Astronomy Essentials
Visible planets and night sky for September and October
The full Harvest Moon shines brightly overnight night tonight, September 28-29. Visible planets for the month of September and October, here.
Human World

A Dyson sphere harvests the energy of stars

A Dyson sphere is a megastructure that could theoretically harvest all the energy of a star and supply an advanced alien civilization.
Moon Phases

September full moon 2023 is a super Harvest Moon

The September full moon - the Harvest Moon supermoon - happens overnight on September 28-29, 2023. This full moon lies between Jupiter and Saturn.
Astronomy Essentials

What makes the Harvest Moon special?

The Northern Hemisphere's Harvest Moon falls overnight September 28-29, 2023, or almost 6 days after the September equinox. It's also a supermoon!

Sycamore Gap tree in the U.K., remembered in images

Sycamore Gap tree in Northumberland National Park was felled overnight on September 27-28, 2023. Here are a few images of the tree flooding social media.
Astronomy Essentials

Last of 4 full supermoons for 2023 is tonight

We had 4 full supermoons in a row in 2023. The last one for this year is tonight. Supermoons look brighter than ordinary full moons.
Astronomy Essentials

Guy Ottewell’s Astronomical Calendar 2024 is here

The popular and information Astronomical Calendar for 2024 by Guy Ottewell is available. It comes in either electronic or printed form. Learn more here.

Space is hard on the human body. Here’s what we’re learning

Space is hard on the human body and mind. Scientists are working to find ways to improve the lives and health of astronauts in space and back at home.
Human World
Moon Phases

Do you sleep less before a full moon? Research says yes

A new study shows that - whether you live in a rural or urban environment - you might sleep less before a full moon.