Mammatus Clouds over Nebraska
When do cloud bottoms appear like bubbles? Normally, cloud bottoms are flat. This is because moist warm air […]
Astronomy
Full Moon Geminids
The dependable annual Geminid meteor shower will be near its peak tonight (December 13/14) and before tomorrow’s dawn. […]
Decorating the Sky
Bright stars, clouds of dust and glowing nebulae decorate this cosmic scene, a skyscape just north of Orion’s […]
N63A: Supernova Remnant in Visible and X-ray
What has this supernova left behind? As little as 2,000 years ago, light from a massive stellar explosion […]
Starlink Satellite Trails over Brazil
What are those streaks over the horizon? New Starlink satellites reflecting sunlight. SpaceX launched 60 Starlink communication satellites […]
Looking Sideways from the Parker Solar Probe
Everybody sees the Sun. Nobody’s been there. Starting in 2018 though, NASA launched the robotic Parker Solar Probe […]
Geminid Meteors over Chile
Are meteors streaming out from a point in the sky? Yes, in a way. When the Earth crosses […]
Lines of Time
In time stars trace lines through the night sky on a rotating planet. Taken over two hours or […]
Pleiades to Hyades
This cosmic vista stretches almost 20 degrees from top to bottom, across the dusty constellation Taurus. It begins […]
Spiral Galaxy NGC 6744
Beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across, larger than our own Milky Way. It lies […]