Planet

Mercury

The smallest planet and the closest to the Sun, with the most eccentric planetary orbit.

NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

The smallest planet, where one day from sunrise to sunrise lasts two whole Mercury years.

Mercury's grey, cratered horizon. — Mercury's cratered limb, seen by NASA's MESSENGER spacecraft. Credit: NASA

Mercury is a rocky world only slightly larger than our Moon. It has almost no atmosphere, so its surface swings between about 430 °C by day and −180 °C at night.

It spins exactly three times for every two orbits around the Sun, so one solar day (sunrise to sunrise) lasts two Mercury years. Its large iron core makes it the second densest planet after Earth.

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Sumber data

Fakta utama
Diameter	4,879 km	[1]
Masa	3.301 × 10²³ kg	[1]
Ketumpatan	5.429 g/cm³	[1]
Graviti permukaan	3.7 m/s²	Diperolehi dari set data
Kelajuan melarikan diri	4.25 km/s	Diperolehi dari set data
Putaran (sidereal)	58.6 hari	[1]
Panjang hari	176 hari	[2]
Masa orbit	88 hari	[3]
Keluasan	0.034°	[2]
Suhu purata	167°C	[2]
Bulan	0	[2]
Jarak purata dari Matahari (pasukan separuh utama)	0.3871 au	[3]

Alat dan pengajaran hanya menggunakan model yang dipermudah untuk pembelajaran. Ia tidak boleh digunakan untuk navigasi, pelancaran misi atau sebarang keputusan operasi. Sijil adalah percuma dan tidak diakui. Baca pengecualian kandungan pendidikan