Mercury and Venus Near the Horizon: When to Look for Them
Mercury never strays more than 28° from the Sun, so look for it at twilight. Learn whether to choose morning or evening—and why location and a clear horizon mat
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132 itemsWhy Mars Is Brighter at Opposition
At opposition, Earth passes between the Sun and Mars, bringing the planet closer and making it appear larger and brighter. But not all oppositions are alike.
✦ Space NewsSpace News Today: How to Verify a Discovery
Space news today: learn what the August 6 spacewalk, August 30 Roman telescope launch and exoplanet discovery confirm—and what they don’t.
Spacecraft Mission Profiles: Flyby, Orbit, and Landing
A spacecraft mission defines its route, scientific objectives, and communications. Compare flyby, orbital study, and landing through the example of Orion.
✦ AstrophysicsPhysicist vs. Astrophysicist: What’s the Difference?
Physicists and astrophysicists use the same laws but study different subjects, from laboratory systems to stars, black holes and galaxies.
✦ TelescopesWhat Does an Astronomical Observer Do?
An astronomical observer selects objects, determines their positions on the celestial sphere and records angular measurements.
✦ Solar SystemThe Old Earth-Centered Model: How It Worked
The old Earth-centered model placed a stationary Earth amid the celestial bodies. We explore why epicycles were needed and why the model gave way to heliocentri
✦ Space NewsSpace News Today: Check the Original Source
Check today’s space news against the date, original source, and event status so you don’t mistake a planned launch for one that happened—or a headline for a res
✦ Space MissionsAstronaut in Space: Fiction and Reality
An astronaut in space is both a science-fiction hero and a real participant in life and work in orbit. Here’s where fiction diverges from what we know.
✦ AstrophysicsNikolai Kardashev: The Astrophysicist and His Scale
Astrophysicist Nikolai Kardashev is known for a scale with three types. Explore what the classification measures—and where its limits lie.
✦ Space NewsSpace: The Latest News — How to Verify a Claim
Check the original source, date, and type of evidence behind space news. Learn how to distinguish confirmation from a claim before drawing conclusions.
✦ CosmologyIs Cosmology a Science? Testing and Its Limits
Cosmology is a science because models of the universe are compared with observations. We examine what can be tested—and where philosophical assumptions begin.